diff --git a/docs/html/reference/requirements-file-format.md b/docs/html/reference/requirements-file-format.md
index 75e6d0b1e6b..01047587161 100644
--- a/docs/html/reference/requirements-file-format.md
+++ b/docs/html/reference/requirements-file-format.md
@@ -109,7 +109,6 @@ and two {ref}`--find-links <install_--find-links>` locations:
 
 The options which can be applied to individual requirements are:
 
-- {ref}`--install-option <install_--install-option>`
 - {ref}`--global-option <install_--global-option>`
 - {ref}`--config-settings <install_--config-settings>`
 - `--hash` (for {ref}`Hash-checking mode`)
@@ -161,7 +160,7 @@ This disables the use of wheels (cached or otherwise). This could mean that buil
 This mechanism is only preserved for backwards compatibility and should be considered deprecated. A future release of pip may drop these options.
 ```
 
-The `--global-option` and `--install-option` options are used to pass options to `setup.py`.
+The `--global-option` option is used to pass options to `setup.py`.
 
 ```{attention}
 These options are highly coupled with how pip invokes setuptools using the {doc}`../reference/build-system/setup-py` build system interface. It is not compatible with newer {doc}`../reference/build-system/pyproject-toml` build system interface.
@@ -171,15 +170,10 @@ This is will not work with other build-backends or newer setup.cfg-only projects
 
 If you have a declaration like:
 
-    FooProject >= 1.2 --global-option="--no-user-cfg" \
-                      --install-option="--prefix='/usr/local'" \
-                      --install-option="--no-compile"
+    FooProject >= 1.2 --global-option="--no-user-cfg"
 
 The above translates roughly into running FooProject's `setup.py` script as:
 
-    python setup.py --no-user-cfg install --prefix='/usr/local' --no-compile
+    python setup.py --no-user-cfg install
 
-Note that the only way of giving more than one option to `setup.py` is through multiple `--global-option` and `--install-option` options, as shown in the example above. The value of each option is passed as a single argument to the `setup.py` script. Therefore, a line such as the following is invalid and would result in an installation error.
-
-    # Invalid. Please use '--install-option' twice as shown above.
-    FooProject >= 1.2 --install-option="--prefix=/usr/local --no-compile"
+Note that the only way of giving more than one option to `setup.py` is through multiple `--global-option` options.
diff --git a/news/11358.removal.rst b/news/11358.removal.rst
new file mode 100644
index 00000000000..23e388a9a39
--- /dev/null
+++ b/news/11358.removal.rst
@@ -0,0 +1 @@
+Remove support for the deprecated ``--install-options``.
diff --git a/src/pip/_internal/cli/cmdoptions.py b/src/pip/_internal/cli/cmdoptions.py
index 6513bec388d..2bbff2d4dc1 100644
--- a/src/pip/_internal/cli/cmdoptions.py
+++ b/src/pip/_internal/cli/cmdoptions.py
@@ -847,17 +847,6 @@ def _handle_config_settings(
     "to pass multiple keys to the backend.",
 )
 
-install_options: Callable[..., Option] = partial(
-    Option,
-    "--install-option",
-    dest="install_options",
-    action="append",
-    metavar="options",
-    help="This option is deprecated. Using this option with location-changing "
-    "options may cause unexpected behavior. "
-    "Use pip-level options like --user, --prefix, --root, and --target.",
-)
-
 build_options: Callable[..., Option] = partial(
     Option,
     "--build-option",
diff --git a/src/pip/_internal/commands/install.py b/src/pip/_internal/commands/install.py
index d25ec9631bc..41d22c72825 100644
--- a/src/pip/_internal/commands/install.py
+++ b/src/pip/_internal/commands/install.py
@@ -5,7 +5,7 @@
 import shutil
 import site
 from optparse import SUPPRESS_HELP, Values
-from typing import Iterable, List, Optional
+from typing import List, Optional
 
 from pip._vendor.rich import print_json
 
@@ -35,7 +35,6 @@
     LegacyInstallReasonFailedBdistWheel,
     deprecated,
 )
-from pip._internal.utils.distutils_args import parse_distutils_args
 from pip._internal.utils.filesystem import test_writable_dir
 from pip._internal.utils.logging import getLogger
 from pip._internal.utils.misc import (
@@ -206,7 +205,6 @@ def add_options(self) -> None:
         self.cmd_opts.add_option(cmdoptions.override_externally_managed())
 
         self.cmd_opts.add_option(cmdoptions.config_settings())
-        self.cmd_opts.add_option(cmdoptions.install_options())
         self.cmd_opts.add_option(cmdoptions.global_options())
 
         self.cmd_opts.add_option(
@@ -297,8 +295,6 @@ def run(self, options: Values, args: List[str]) -> int:
 
         cmdoptions.check_dist_restriction(options, check_target=True)
 
-        install_options = options.install_options or []
-
         logger.verbose("Using %s", get_pip_version())
         options.use_user_site = decide_user_install(
             options.use_user_site,
@@ -378,8 +374,6 @@ def run(self, options: Values, args: List[str]) -> int:
             for req in reqs:
                 req.permit_editable_wheels = True
 
-            reject_location_related_install_options(reqs, options.install_options)
-
             preparer = self.make_requirement_preparer(
                 temp_build_dir=directory,
                 options=options,
@@ -490,7 +484,6 @@ def run(self, options: Values, args: List[str]) -> int:
 
             installed = install_given_reqs(
                 to_install,
-                install_options,
                 global_options,
                 root=options.root_path,
                 home=target_temp_dir_path,
@@ -761,45 +754,6 @@ def decide_user_install(
     return True
 
 
-def reject_location_related_install_options(
-    requirements: List[InstallRequirement], options: Optional[List[str]]
-) -> None:
-    """If any location-changing --install-option arguments were passed for
-    requirements or on the command-line, then show a deprecation warning.
-    """
-
-    def format_options(option_names: Iterable[str]) -> List[str]:
-        return ["--{}".format(name.replace("_", "-")) for name in option_names]
-
-    offenders = []
-
-    for requirement in requirements:
-        install_options = requirement.install_options
-        location_options = parse_distutils_args(install_options)
-        if location_options:
-            offenders.append(
-                "{!r} from {}".format(
-                    format_options(location_options.keys()), requirement
-                )
-            )
-
-    if options:
-        location_options = parse_distutils_args(options)
-        if location_options:
-            offenders.append(
-                "{!r} from command line".format(format_options(location_options.keys()))
-            )
-
-    if not offenders:
-        return
-
-    raise CommandError(
-        "Location-changing options found in --install-option: {}."
-        " This is unsupported, use pip-level options like --user,"
-        " --prefix, --root, and --target instead.".format("; ".join(offenders))
-    )
-
-
 def create_os_error_message(
     error: OSError, show_traceback: bool, using_user_site: bool
 ) -> str:
diff --git a/src/pip/_internal/operations/install/editable_legacy.py b/src/pip/_internal/operations/install/editable_legacy.py
index bb548cdca75..bebe24e6d3a 100644
--- a/src/pip/_internal/operations/install/editable_legacy.py
+++ b/src/pip/_internal/operations/install/editable_legacy.py
@@ -1,7 +1,7 @@
 """Legacy editable installation process, i.e. `setup.py develop`.
 """
 import logging
-from typing import List, Optional, Sequence
+from typing import Optional, Sequence
 
 from pip._internal.build_env import BuildEnvironment
 from pip._internal.utils.logging import indent_log
@@ -12,7 +12,7 @@
 
 
 def install_editable(
-    install_options: List[str],
+    *,
     global_options: Sequence[str],
     prefix: Optional[str],
     home: Optional[str],
@@ -31,7 +31,6 @@ def install_editable(
     args = make_setuptools_develop_args(
         setup_py_path,
         global_options=global_options,
-        install_options=install_options,
         no_user_config=isolated,
         prefix=prefix,
         home=home,
diff --git a/src/pip/_internal/operations/install/legacy.py b/src/pip/_internal/operations/install/legacy.py
index 290967dd6d5..0b108d0ca71 100644
--- a/src/pip/_internal/operations/install/legacy.py
+++ b/src/pip/_internal/operations/install/legacy.py
@@ -55,7 +55,6 @@ def prepend_root(path: str) -> str:
 
 
 def install(
-    install_options: List[str],
     global_options: Sequence[str],
     root: Optional[str],
     home: Optional[str],
@@ -79,7 +78,6 @@ def install(
             install_args = make_setuptools_install_args(
                 setup_py_path,
                 global_options=global_options,
-                install_options=install_options,
                 record_filename=record_filename,
                 root=root,
                 prefix=prefix,
diff --git a/src/pip/_internal/req/__init__.py b/src/pip/_internal/req/__init__.py
index 8d563596668..16de903a44c 100644
--- a/src/pip/_internal/req/__init__.py
+++ b/src/pip/_internal/req/__init__.py
@@ -36,7 +36,6 @@ def _validate_requirements(
 
 def install_given_reqs(
     requirements: List[InstallRequirement],
-    install_options: List[str],
     global_options: Sequence[str],
     root: Optional[str],
     home: Optional[str],
@@ -71,7 +70,6 @@ def install_given_reqs(
 
             try:
                 requirement.install(
-                    install_options,
                     global_options,
                     root=root,
                     home=home,
diff --git a/src/pip/_internal/req/constructors.py b/src/pip/_internal/req/constructors.py
index dea7c3b0116..854b1b058d8 100644
--- a/src/pip/_internal/req/constructors.py
+++ b/src/pip/_internal/req/constructors.py
@@ -222,7 +222,6 @@ def install_req_from_editable(
         constraint=constraint,
         use_pep517=use_pep517,
         isolated=isolated,
-        install_options=options.get("install_options", []) if options else [],
         global_options=options.get("global_options", []) if options else [],
         hash_options=options.get("hashes", {}) if options else {},
         config_settings=config_settings,
@@ -399,7 +398,6 @@ def install_req_from_line(
         markers=parts.markers,
         use_pep517=use_pep517,
         isolated=isolated,
-        install_options=options.get("install_options", []) if options else [],
         global_options=options.get("global_options", []) if options else [],
         hash_options=options.get("hashes", {}) if options else {},
         config_settings=config_settings,
@@ -493,7 +491,6 @@ def install_req_from_link_and_ireq(
         markers=ireq.markers,
         use_pep517=ireq.use_pep517,
         isolated=ireq.isolated,
-        install_options=ireq.install_options,
         global_options=ireq.global_options,
         hash_options=ireq.hash_options,
         config_settings=ireq.config_settings,
diff --git a/src/pip/_internal/req/req_file.py b/src/pip/_internal/req/req_file.py
index 11ec699acc5..f8f07b0cd96 100644
--- a/src/pip/_internal/req/req_file.py
+++ b/src/pip/_internal/req/req_file.py
@@ -69,7 +69,6 @@
 
 # options to be passed to requirements
 SUPPORTED_OPTIONS_REQ: List[Callable[..., optparse.Option]] = [
-    cmdoptions.install_options,
     cmdoptions.global_options,
     cmdoptions.hash,
 ]
diff --git a/src/pip/_internal/req/req_install.py b/src/pip/_internal/req/req_install.py
index bb38ec09da4..fa5620e1d6e 100644
--- a/src/pip/_internal/req/req_install.py
+++ b/src/pip/_internal/req/req_install.py
@@ -83,7 +83,7 @@ def __init__(
         markers: Optional[Marker] = None,
         use_pep517: Optional[bool] = None,
         isolated: bool = False,
-        install_options: Optional[List[str]] = None,
+        *,
         global_options: Optional[List[str]] = None,
         hash_options: Optional[Dict[str, List[str]]] = None,
         config_settings: Optional[Dict[str, str]] = None,
@@ -146,7 +146,6 @@ def __init__(
         # Set to True after successful installation
         self.install_succeeded: Optional[bool] = None
         # Supplied options
-        self.install_options = install_options if install_options else []
         self.global_options = global_options if global_options else []
         self.hash_options = hash_options if hash_options else {}
         self.config_settings = config_settings
@@ -746,7 +745,6 @@ def archive(self, build_dir: Optional[str]) -> None:
 
     def install(
         self,
-        install_options: List[str],
         global_options: Optional[Sequence[str]] = None,
         root: Optional[str] = None,
         home: Optional[str] = None,
@@ -767,8 +765,7 @@ def install(
         global_options = global_options if global_options is not None else []
         if self.editable and not self.is_wheel:
             install_editable_legacy(
-                install_options,
-                global_options,
+                global_options=global_options,
                 prefix=prefix,
                 home=home,
                 use_user_site=use_user_site,
@@ -808,13 +805,12 @@ def install(
 
         # TODO: Why don't we do this for editable installs?
 
-        # Extend the list of global and install options passed on to
+        # Extend the list of global options passed on to
         # the setup.py call with the ones from the requirements file.
         # Options specified in requirements file override those
         # specified on the command line, since the last option given
         # to setup.py is the one that is used.
         global_options = list(global_options) + self.global_options
-        install_options = list(install_options) + self.install_options
 
         try:
             if (
@@ -823,7 +819,6 @@ def install(
             ):
                 self.legacy_install_reason.emit_deprecation(self.name)
             success = install_legacy(
-                install_options=install_options,
                 global_options=global_options,
                 root=root,
                 home=home,
@@ -893,15 +888,6 @@ def _has_option(options: Values, reqs: List[InstallRequirement], option: str) ->
     return False
 
 
-def _install_option_ignored(
-    install_options: List[str], reqs: List[InstallRequirement]
-) -> bool:
-    for req in reqs:
-        if (install_options or req.install_options) and not req.use_pep517:
-            return False
-    return True
-
-
 class LegacySetupPyOptionsCheckMode(Enum):
     INSTALL = 1
     WHEEL = 2
@@ -913,34 +899,15 @@ def check_legacy_setup_py_options(
     reqs: List[InstallRequirement],
     mode: LegacySetupPyOptionsCheckMode,
 ) -> None:
-    has_install_options = _has_option(options, reqs, "install_options")
     has_build_options = _has_option(options, reqs, "build_options")
     has_global_options = _has_option(options, reqs, "global_options")
-    legacy_setup_py_options_present = (
-        has_install_options or has_build_options or has_global_options
-    )
+    legacy_setup_py_options_present = has_build_options or has_global_options
     if not legacy_setup_py_options_present:
         return
 
     options.format_control.disallow_binaries()
     logger.warning(
         "Implying --no-binary=:all: due to the presence of "
-        "--build-option / --global-option / --install-option. "
+        "--build-option / --global-option. "
         "Consider using --config-settings for more flexibility.",
     )
-    if mode == LegacySetupPyOptionsCheckMode.INSTALL and has_install_options:
-        if _install_option_ignored(options.install_options, reqs):
-            logger.warning(
-                "Ignoring --install-option when building using PEP 517",
-            )
-        else:
-            deprecated(
-                reason=(
-                    "--install-option is deprecated because "
-                    "it forces pip to use the 'setup.py install' "
-                    "command which is itself deprecated."
-                ),
-                issue=11358,
-                replacement="to use --config-settings",
-                gone_in="23.1",
-            )
diff --git a/src/pip/_internal/resolution/resolvelib/candidates.py b/src/pip/_internal/resolution/resolvelib/candidates.py
index f5bc343b91b..7f09efc1539 100644
--- a/src/pip/_internal/resolution/resolvelib/candidates.py
+++ b/src/pip/_internal/resolution/resolvelib/candidates.py
@@ -66,7 +66,6 @@ def make_install_req_from_link(
         isolated=template.isolated,
         constraint=template.constraint,
         options=dict(
-            install_options=template.install_options,
             global_options=template.global_options,
             hashes=template.hash_options,
         ),
@@ -90,7 +89,6 @@ def make_install_req_from_editable(
         constraint=template.constraint,
         permit_editable_wheels=template.permit_editable_wheels,
         options=dict(
-            install_options=template.install_options,
             global_options=template.global_options,
             hashes=template.hash_options,
         ),
@@ -115,7 +113,6 @@ def _make_install_req_from_dist(
         isolated=template.isolated,
         constraint=template.constraint,
         options=dict(
-            install_options=template.install_options,
             global_options=template.global_options,
             hashes=template.hash_options,
         ),
diff --git a/src/pip/_internal/utils/distutils_args.py b/src/pip/_internal/utils/distutils_args.py
deleted file mode 100644
index 2fd1862073f..00000000000
--- a/src/pip/_internal/utils/distutils_args.py
+++ /dev/null
@@ -1,43 +0,0 @@
-from getopt import GetoptError, getopt
-from typing import Dict, List
-
-_options = [
-    "exec-prefix=",
-    "home=",
-    "install-base=",
-    "install-data=",
-    "install-headers=",
-    "install-lib=",
-    "install-platlib=",
-    "install-purelib=",
-    "install-scripts=",
-    "prefix=",
-    "root=",
-    "user",
-]
-
-
-def parse_distutils_args(args: List[str]) -> Dict[str, str]:
-    """Parse provided arguments, returning an object that has the matched arguments.
-
-    Any unknown arguments are ignored.
-    """
-    result = {}
-    for arg in args:
-        try:
-            parsed_opt, _ = getopt(args=[arg], shortopts="", longopts=_options)
-        except GetoptError:
-            # We don't care about any other options, which here may be
-            # considered unrecognized since our option list is not
-            # exhaustive.
-            continue
-
-        if not parsed_opt:
-            continue
-
-        option = parsed_opt[0]
-        name_from_parsed = option[0][2:].replace("-", "_")
-        value_from_parsed = option[1] or "true"
-        result[name_from_parsed] = value_from_parsed
-
-    return result
diff --git a/src/pip/_internal/utils/setuptools_build.py b/src/pip/_internal/utils/setuptools_build.py
index 01ef4a4ca59..0662915cb05 100644
--- a/src/pip/_internal/utils/setuptools_build.py
+++ b/src/pip/_internal/utils/setuptools_build.py
@@ -103,8 +103,8 @@ def make_setuptools_clean_args(
 
 def make_setuptools_develop_args(
     setup_py_path: str,
+    *,
     global_options: Sequence[str],
-    install_options: Sequence[str],
     no_user_config: bool,
     prefix: Optional[str],
     home: Optional[str],
@@ -120,8 +120,6 @@ def make_setuptools_develop_args(
 
     args += ["develop", "--no-deps"]
 
-    args += install_options
-
     if prefix:
         args += ["--prefix", prefix]
     if home is not None:
@@ -150,8 +148,8 @@ def make_setuptools_egg_info_args(
 
 def make_setuptools_install_args(
     setup_py_path: str,
+    *,
     global_options: Sequence[str],
-    install_options: Sequence[str],
     record_filename: str,
     root: Optional[str],
     prefix: Optional[str],
@@ -190,6 +188,4 @@ def make_setuptools_install_args(
     if header_dir:
         args += ["--install-headers", header_dir]
 
-    args += install_options
-
     return args
diff --git a/tests/functional/test_install.py b/tests/functional/test_install.py
index 94272a63e54..5d2f78c25ec 100644
--- a/tests/functional/test_install.py
+++ b/tests/functional/test_install.py
@@ -857,29 +857,6 @@ def test_install_with_hacked_egg_info(
     assert "Successfully installed hackedegginfo-0.0.0\n" in result.stdout
 
 
-@pytest.mark.network
-def test_install_using_install_option_and_editable(
-    script: PipTestEnvironment, tmpdir: Path
-) -> None:
-    """
-    Test installing a tool using -e and --install-option
-    """
-    folder = "script_folder"
-    script.scratch_path.joinpath(folder).mkdir()
-    url = local_checkout("git+https://github.com/pypa/pip-test-package", tmpdir)
-    result = script.pip(
-        "install",
-        "-e",
-        f"{url}#egg=pip-test-package",
-        f"--install-option=--script-dir={folder}",
-        expect_stderr=True,
-    )
-    script_file = (
-        script.venv / "src/pip-test-package" / folder / f"pip-test-package{script.exe}"
-    )
-    result.did_create(script_file)
-
-
 @pytest.mark.xfail
 @pytest.mark.network
 @need_mercurial
diff --git a/tests/functional/test_install_reqs.py b/tests/functional/test_install_reqs.py
index 14e1056ae7a..5490b301cd0 100644
--- a/tests/functional/test_install_reqs.py
+++ b/tests/functional/test_install_reqs.py
@@ -332,33 +332,6 @@ def test_wheel_user_with_prefix_in_pydistutils_cfg(
     assert "installed requiresupper" in result.stdout
 
 
-def test_install_option_in_requirements_file_overrides_cli(
-    script: PipTestEnvironment,
-    arg_recording_sdist_maker: Callable[[str], ArgRecordingSdist],
-) -> None:
-    simple_sdist = arg_recording_sdist_maker("simple")
-
-    reqs_file = script.scratch_path.joinpath("reqs.txt")
-    reqs_file.write_text("simple --install-option='-O0'")
-
-    result = script.pip(
-        "install",
-        "--no-index",
-        "-f",
-        str(simple_sdist.sdist_path.parent),
-        "-r",
-        str(reqs_file),
-        "--install-option=-O1",
-        allow_stderr_warning=True,
-    )
-    simple_args = simple_sdist.args()
-    assert "install" in simple_args
-    assert simple_args.index("-O1") < simple_args.index("-O0")
-    assert "Implying --no-binary=:all:" in result.stderr
-    assert "Consider using --config-settings" in result.stderr
-    assert "--install-option is deprecated" in result.stderr
-
-
 def test_constraints_not_installed_by_default(
     script: PipTestEnvironment, data: TestData
 ) -> None:
@@ -759,61 +732,3 @@ def test_install_unsupported_wheel_file(
         in result.stderr
     )
     assert len(result.files_created) == 0
-
-
-def test_install_options_local_to_package(
-    script: PipTestEnvironment,
-    arg_recording_sdist_maker: Callable[[str], ArgRecordingSdist],
-) -> None:
-    """Make sure --install-options does not leak across packages.
-
-    A requirements.txt file can have per-package --install-options; these
-    should be isolated to just the package instead of leaking to subsequent
-    packages.  This needs to be a functional test because the bug was around
-    cross-contamination at install time.
-    """
-
-    simple1_sdist = arg_recording_sdist_maker("simple1")
-    simple2_sdist = arg_recording_sdist_maker("simple2")
-
-    reqs_file = script.scratch_path.joinpath("reqs.txt")
-    reqs_file.write_text(
-        textwrap.dedent(
-            """
-            simple1 --install-option='-O0'
-            simple2
-            """
-        )
-    )
-    script.pip(
-        "install",
-        "--no-index",
-        "-f",
-        str(simple1_sdist.sdist_path.parent),
-        "-r",
-        reqs_file,
-        allow_stderr_warning=True,
-    )
-
-    simple1_args = simple1_sdist.args()
-    assert "install" in simple1_args
-    assert "-O0" in simple1_args
-    simple2_args = simple2_sdist.args()
-    assert "install" in simple2_args
-    assert "-O0" not in simple2_args
-
-
-def test_location_related_install_option_fails(script: PipTestEnvironment) -> None:
-    simple_sdist = create_basic_sdist_for_package(script, "simple", "0.1.0")
-    reqs_file = script.scratch_path.joinpath("reqs.txt")
-    reqs_file.write_text("simple --install-option='--home=/tmp'")
-    result = script.pip(
-        "install",
-        "--no-index",
-        "-f",
-        str(simple_sdist.parent),
-        "-r",
-        reqs_file,
-        expect_error=True,
-    )
-    assert "['--home'] from simple" in result.stderr
diff --git a/tests/unit/test_command_install.py b/tests/unit/test_command_install.py
index 69792dd9839..5e7889fe16b 100644
--- a/tests/unit/test_command_install.py
+++ b/tests/unit/test_command_install.py
@@ -2,16 +2,9 @@
 from unittest import mock
 
 import pytest
-from pip._vendor.packaging.requirements import Requirement
 
 from pip._internal.commands import install
-from pip._internal.commands.install import (
-    create_os_error_message,
-    decide_user_install,
-    reject_location_related_install_options,
-)
-from pip._internal.exceptions import CommandError
-from pip._internal.req.req_install import InstallRequirement
+from pip._internal.commands.install import create_os_error_message, decide_user_install
 
 
 class TestDecideUserInstall:
@@ -48,37 +41,6 @@ def test_most_cases(
         assert decide_user_install(use_user_site=None) is result
 
 
-def test_rejection_for_pip_install_options() -> None:
-    install_options = ["--prefix=/hello"]
-    with pytest.raises(CommandError) as e:
-        reject_location_related_install_options([], install_options)
-
-    assert "['--prefix'] from command line" in str(e.value)
-
-
-def test_rejection_for_location_requirement_options() -> None:
-    bad_named_req_options = ["--home=/wow"]
-    bad_named_req = InstallRequirement(
-        Requirement("hello"), "requirements.txt", install_options=bad_named_req_options
-    )
-
-    bad_unnamed_req_options = ["--install-lib=/lib"]
-    bad_unnamed_req = InstallRequirement(
-        None, "requirements2.txt", install_options=bad_unnamed_req_options
-    )
-
-    with pytest.raises(CommandError) as e:
-        reject_location_related_install_options(
-            [bad_named_req, bad_unnamed_req], options=[]
-        )
-
-    assert (
-        "['--install-lib'] from <InstallRequirement> (from requirements2.txt)"
-        in str(e.value)
-    )
-    assert "['--home'] from hello (from requirements.txt)" in str(e.value)
-
-
 @pytest.mark.parametrize(
     "error, show_traceback, using_user_site, expected",
     [
diff --git a/tests/unit/test_req_file.py b/tests/unit/test_req_file.py
index 228d0aaa49c..30cbcf71c16 100644
--- a/tests/unit/test_req_file.py
+++ b/tests/unit/test_req_file.py
@@ -344,14 +344,10 @@ def test_nested_constraints_file(
         assert reqs[0].constraint
 
     def test_options_on_a_requirement_line(self, line_processor: LineProcessor) -> None:
-        line = (
-            "SomeProject --install-option=yo1 --install-option yo2 "
-            '--global-option="yo3" --global-option "yo4"'
-        )
+        line = 'SomeProject --global-option="yo3" --global-option "yo4"'
         filename = "filename"
         req = line_processor(line, filename, 1)[0]
         assert req.global_options == ["yo3", "yo4"]
-        assert req.install_options == ["yo1", "yo2"]
 
     def test_hash_options(self, line_processor: LineProcessor) -> None:
         """Test the --hash option: mostly its value storage.
@@ -870,14 +866,12 @@ def test_install_requirements_with_options(
         options: mock.Mock,
     ) -> None:
         global_option = "--dry-run"
-        install_option = "--prefix=/opt"
 
         content = """
         --only-binary :all:
-        INITools==2.0 --global-option="{global_option}" \
-                        --install-option "{install_option}"
+        INITools==2.0 --global-option="{global_option}"
         """.format(
-            global_option=global_option, install_option=install_option
+            global_option=global_option
         )
 
         with requirements_file(content, tmpdir) as reqs_file:
@@ -897,9 +891,4 @@ def test_install_requirements_with_options(
 
             last_call = popen.call_args_list[-1]
             args = last_call[0][0]
-            assert (
-                0
-                < args.index(global_option)
-                < args.index("install")
-                < args.index(install_option)
-            )
+            assert 0 < args.index(global_option) < args.index("install")
diff --git a/tests/unit/test_utils_distutils_args.py b/tests/unit/test_utils_distutils_args.py
deleted file mode 100644
index 21f31e926f2..00000000000
--- a/tests/unit/test_utils_distutils_args.py
+++ /dev/null
@@ -1,63 +0,0 @@
-import pytest
-
-from pip._internal.utils.distutils_args import parse_distutils_args
-
-
-def test_unknown_option_is_ok() -> None:
-    result = parse_distutils_args(["--foo"])
-    assert not result
-
-
-def test_option_is_returned() -> None:
-    result = parse_distutils_args(["--prefix=hello"])
-    assert result["prefix"] == "hello"
-
-
-def test_options_are_clobbered() -> None:
-    # Matches the current setuptools behavior that the last argument
-    # wins.
-    result = parse_distutils_args(["--prefix=hello", "--prefix=world"])
-    assert result["prefix"] == "world"
-
-
-def test_multiple_options_work() -> None:
-    result = parse_distutils_args(["--prefix=hello", "--root=world"])
-    assert result["prefix"] == "hello"
-    assert result["root"] == "world"
-
-
-def test_multiple_invocations_do_not_keep_options() -> None:
-    result = parse_distutils_args(["--prefix=hello1"])
-    assert len(result) == 1
-    assert result["prefix"] == "hello1"
-
-    result = parse_distutils_args(["--root=world1"])
-    assert len(result) == 1
-    assert result["root"] == "world1"
-
-
-@pytest.mark.parametrize(
-    "name,value",
-    [
-        ("exec-prefix", "1"),
-        ("home", "2"),
-        ("install-base", "3"),
-        ("install-data", "4"),
-        ("install-headers", "5"),
-        ("install-lib", "6"),
-        ("install-platlib", "7"),
-        ("install-purelib", "8"),
-        ("install-scripts", "9"),
-        ("prefix", "10"),
-        ("root", "11"),
-    ],
-)
-def test_all_value_options_work(name: str, value: str) -> None:
-    result = parse_distutils_args([f"--{name}={value}"])
-    key_name = name.replace("-", "_")
-    assert result[key_name] == value
-
-
-def test_user_option_works() -> None:
-    result = parse_distutils_args(["--user"])
-    assert result["user"]