diff --git a/.changeset/heavy-windows-build.md b/.changeset/heavy-windows-build.md
new file mode 100644
index 0000000000..25ed821ac6
--- /dev/null
+++ b/.changeset/heavy-windows-build.md
@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Added Tomb Mainnet.
diff --git a/src/chains/definitions/tomb.ts b/src/chains/definitions/tomb.ts
new file mode 100644
index 0000000000..f543dd2ac9
--- /dev/null
+++ b/src/chains/definitions/tomb.ts
@@ -0,0 +1,19 @@
+import { defineChain } from '../../utils/chain/defineChain.js'
+
+export const tomb = /*#__PURE__*/ defineChain({
+  id: 6969,
+  name: 'Tomb Mainnet',
+  nativeCurrency: { name: 'TOMB', symbol: 'TOMB', decimals: 18 },
+  rpcUrls: {
+    default: {
+      http: ['https://rpc.tombchain.com'],
+    },
+  },
+  blockExplorers: {
+    default: {
+      name: 'Tomb Explorer',
+      url: 'https://tombscout.com',
+    },
+  },
+  testnet: false,
+})
diff --git a/src/chains/index.ts b/src/chains/index.ts
index 97c9468e14..9293b2baab 100644
--- a/src/chains/index.ts
+++ b/src/chains/index.ts
@@ -370,6 +370,7 @@ export { thaiChain } from './definitions/thaiChain.js'
 export { thunderCore } from './definitions/thunderCore.js'
 export { thunderTestnet } from './definitions/thunderTestnet.js'
 export { tiktrixTestnet } from './definitions/tiktrixTestnet.js'
+export { tomb } from './definitions/tomb.js'
 export { tron } from './definitions/tron.js'
 export { ultron } from './definitions/ultron.js'
 export { ultronTestnet } from './definitions/ultronTestnet.js'