diff --git a/.changeset/witty-beans-punch.md b/.changeset/witty-beans-punch.md
new file mode 100644
index 0000000000..ca33c079f1
--- /dev/null
+++ b/.changeset/witty-beans-punch.md
@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Added sei chain
diff --git a/src/chains/definitions/sei.ts b/src/chains/definitions/sei.ts
new file mode 100644
index 0000000000..801da2f74a
--- /dev/null
+++ b/src/chains/definitions/sei.ts
@@ -0,0 +1,24 @@
+import { defineChain } from '../../utils/chain/defineChain.js'
+
+export const sei = /*#__PURE__*/ defineChain({
+  id: 1329,
+  name: 'Sei Network',
+  nativeCurrency: { name: 'Sei', symbol: 'SEI', decimals: 18 },
+  rpcUrls: {
+    default: {
+      http: ['https://evm-rpc.sei-apis.com/'],
+      webSocket: ['wss://evm-ws.sei-apis.com/'],
+    },
+  },
+  blockExplorers: {
+    default: {
+      name: 'Seitrace',
+      url: 'https://seitrace.com',
+    },
+  },
+  contracts: {
+    multicall3: {
+      address: '0xcA11bde05977b3631167028862bE2a173976CA11',
+    },
+  },
+})
diff --git a/src/chains/index.ts b/src/chains/index.ts
index 8f47ef09cb..73eb4ac347 100644
--- a/src/chains/index.ts
+++ b/src/chains/index.ts
@@ -214,6 +214,7 @@ export { sapphire } from './definitions/sapphire.js'
 export { sapphireTestnet } from './definitions/sapphireTestnet.js'
 export { scroll } from './definitions/scroll.js'
 export { scrollSepolia } from './definitions/scrollSepolia.js'
+export { sei } from './definitions/sei.js'
 export { seiDevnet } from './definitions/seiDevnet.js'
 export { sepolia } from './definitions/sepolia.js'
 export { shimmer } from './definitions/shimmer.js'