diff --git a/.changeset/strong-pandas-change.md b/.changeset/strong-pandas-change.md
new file mode 100644
index 0000000000..63b6f87e21
--- /dev/null
+++ b/.changeset/strong-pandas-change.md
@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Added Omax Mainnet.
diff --git a/src/chains/definitions/omax.ts b/src/chains/definitions/omax.ts
new file mode 100644
index 0000000000..546766b06e
--- /dev/null
+++ b/src/chains/definitions/omax.ts
@@ -0,0 +1,21 @@
+import { defineChain } from '../../utils/chain/defineChain.js'
+
+export const omax = /*#__PURE__*/ defineChain({
+  id: 311,
+  name: 'Omax Mainnet',
+  nativeCurrency: {
+    decimals: 18,
+    name: 'OMAX',
+    symbol: 'OMAX',
+  },
+  rpcUrls: {
+    default: { http: ['https://mainapi.omaxray.com'] },
+  },
+  blockExplorers: {
+    default: {
+      name: 'Omax Explorer',
+      url: 'https://omaxscan.com',
+    },
+  },
+  testnet: false,
+})
diff --git a/src/chains/index.ts b/src/chains/index.ts
index e3cce43c7d..224d66b160 100644
--- a/src/chains/index.ts
+++ b/src/chains/index.ts
@@ -278,6 +278,7 @@ export { oasisTestnet } from './definitions/oasisTestnet.js'
 export { oasys } from './definitions/oasys.js'
 export { odysseyTestnet } from './definitions/odysseyTestnet.js'
 export { okc } from './definitions/okc.js'
+export { omax } from './definitions/omax.js'
 export { oneWorld } from './definitions/oneWorld.js'
 export { oortMainnetDev } from './definitions/oortmainnetDev.js'
 export { opBNB } from './definitions/opBNB.js'