diff --git a/.changeset/cool-rats-do.md b/.changeset/cool-rats-do.md
new file mode 100644
index 0000000000..2d49973182
--- /dev/null
+++ b/.changeset/cool-rats-do.md
@@ -0,0 +1,5 @@
+---
+"@nomiclabs/hardhat-etherscan": patch
+---
+
+Add support for the Avalanche Mainnet and Fuji chains (thanks @marcelomorgado!)
diff --git a/packages/hardhat-etherscan/src/network/prober.ts b/packages/hardhat-etherscan/src/network/prober.ts
index 41d39db82d..569da90604 100644
--- a/packages/hardhat-etherscan/src/network/prober.ts
+++ b/packages/hardhat-etherscan/src/network/prober.ts
@@ -40,6 +40,9 @@ enum NetworkID {
   // Arbitrum
   ARBITRUM_ONE = 42161,
   ARBITRUM_TESTNET = 421611,
+  // Avalanche
+  AVALANCHE = 43114,
+  AVALANCHE_FUJI_TESTNET = 43113,
 }
 
 const networkIDtoEndpoints: NetworkMap = {
@@ -111,6 +114,14 @@ const networkIDtoEndpoints: NetworkMap = {
     apiURL: "https://api-testnet.arbiscan.io/api",
     browserURL: "https://testnet.arbiscan.io/",
   },
+  [NetworkID.AVALANCHE]: {
+    apiURL: "https://api.snowtrace.io/api",
+    browserURL: "https://snowtrace.io/",
+  },
+  [NetworkID.AVALANCHE_FUJI_TESTNET]: {
+    apiURL: "https://api-testnet.snowtrace.io/api",
+    browserURL: "https://testnet.snowtrace.io/",
+  },
 };
 
 export async function getEtherscanEndpoints(