diff --git a/.changeset/perfect-baboons-collect.md b/.changeset/perfect-baboons-collect.md
new file mode 100644
index 0000000000..08edc9399c
--- /dev/null
+++ b/.changeset/perfect-baboons-collect.md
@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Added Swan chain.
diff --git a/src/chains/definitions/swan.ts b/src/chains/definitions/swan.ts
new file mode 100644
index 0000000000..2d8eb5c436
--- /dev/null
+++ b/src/chains/definitions/swan.ts
@@ -0,0 +1,17 @@
+import { defineChain } from '../../utils/chain/defineChain.js'
+
+export const swan = /*#__PURE__*/ defineChain({
+  id: 254,
+  name: 'Swan Chain Mainnet',
+  nativeCurrency: { name: 'Ether', symbol: 'ETH', decimals: 18 },
+  rpcUrls: {
+    default: { http: ['https://mainnet-rpc.swanchain.org'] },
+  },
+  blockExplorers: {
+    default: {
+      name: 'Swan Explorer',
+      url: 'https://swanscan.io',
+    },
+  },
+  testnet: false,
+})
diff --git a/src/chains/definitions/swanProximaTestnet.ts b/src/chains/definitions/swanProximaTestnet.ts
new file mode 100644
index 0000000000..e365f33c2f
--- /dev/null
+++ b/src/chains/definitions/swanProximaTestnet.ts
@@ -0,0 +1,17 @@
+import { defineChain } from '../../utils/chain/defineChain.js'
+
+export const swanProximaTestnet = /*#__PURE__*/ defineChain({
+  id: 20241133,
+  name: 'Swan Proxima Testnet',
+  nativeCurrency: { name: 'Swan Ether', symbol: 'sETH', decimals: 18 },
+  rpcUrls: {
+    default: { http: ['https://rpc-proxima.swanchain.io	'] },
+  },
+  blockExplorers: {
+    default: {
+      name: 'Swan Explorer',
+      url: 'https://proxima-explorer.swanchain.io',
+    },
+  },
+  testnet: true,
+})
diff --git a/src/chains/definitions/swanSaturnTestnet.ts b/src/chains/definitions/swanSaturnTestnet.ts
new file mode 100644
index 0000000000..72f5026836
--- /dev/null
+++ b/src/chains/definitions/swanSaturnTestnet.ts
@@ -0,0 +1,17 @@
+import { defineChain } from '../../utils/chain/defineChain.js'
+
+export const swanSaturnTestnet = /*#__PURE__*/ defineChain({
+  id: 2024,
+  name: 'Swan Saturn Testnet',
+  nativeCurrency: { name: 'Swan Ether', symbol: 'sETH', decimals: 18 },
+  rpcUrls: {
+    default: { http: ['https://saturn-rpc.swanchain.io'] },
+  },
+  blockExplorers: {
+    default: {
+      name: 'Swan Explorer',
+      url: 'https://saturn-explorer.swanchain.io',
+    },
+  },
+  testnet: true,
+})
diff --git a/src/chains/index.ts b/src/chains/index.ts
index 5e701c76f3..a98ac37254 100644
--- a/src/chains/index.ts
+++ b/src/chains/index.ts
@@ -299,6 +299,9 @@ export { storyTestnet } from './definitions/storyTestnet.js'
 export { silicon } from './definitions/silicon.js'
 export { siliconSepolia } from './definitions/siliconSepolia.js'
 export { stratis } from './definitions/stratis.js'
+export { swan } from './definitions/swan.js'
+export { swanProximaTestnet } from './definitions/swanProximaTestnet.js'
+export { swanSaturnTestnet } from './definitions/swanSaturnTestnet.js'
 export { syscoin } from './definitions/syscoin.js'
 export { syscoinTestnet } from './definitions/syscoinTestnet.js'
 export { taraxa } from './definitions/taraxa.js'