diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0b8dc72eb2c..f00527e9dad 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,8 @@
 - docs: fix dead link in documentation ([#13437](https://github.com/filecoin-project/lotus/pull/13437))
 - feat(cli): implement FRC-0102 signing envelope for wallet sign/verify ([filecoin-project/lotus#13471](https://github.com/filecoin-project/lotus/pull/13471))
 - feat(cli): add --order-by-nonce flag to list messages sequentially when filtering by sender ([filecoin-project/lotus#13394](https://github.com/filecoin-project/lotus/pull/13394))
+- fix(eth): use error code 3 for EExecutionReverted for Ethereum RPC tooling compatibility ([filecoin-project/lotus#13467](https://github.com/filecoin-project/lotus/pull/13467))
+  - BREAKING: RPC error codes changed - EActorNotFound (3→11), EExecutionReverted (11→3). Mismatched client/server versions will deserialize these errors as the wrong Go type, breaking errors.Is/As checks.
 
 # Node v1.34.3 / 2025-12-03
 
diff --git a/api/api_errors.go b/api/api_errors.go
index 3d4854261fd..480518ff099 100644
--- a/api/api_errors.go
+++ b/api/api_errors.go
@@ -19,7 +19,7 @@ var invalidExecutionRevertedMsg = xerrors.New("invalid execution reverted error"
 
 const (
 	EOutOfGas = iota + jsonrpc.FirstUserCode
-	EActorNotFound
+	EExecutionReverted
 	EF3Disabled
 	EF3ParticipationTicketInvalid
 	EF3ParticipationTicketExpired
@@ -27,7 +27,7 @@ const (
 	EF3ParticipationTooManyInstances
 	EF3ParticipationTicketStartBeforeExisting
 	EF3NotReady
-	EExecutionReverted
+	EActorNotFound
 	ENullRound
 	EPaymentChannelDisabled
 )
diff --git a/itests/fevm_test.go b/itests/fevm_test.go
index 53daa49c815..8611f245b10 100644
--- a/itests/fevm_test.go
+++ b/itests/fevm_test.go
@@ -1066,6 +1066,34 @@ func TestFEVMErrorParsing(t *testing.T) {
 			})
 		})
 	}
+
+	// Verify that the raw JSON-RPC error code is 3, per Ethereum standard for execution reverted.
+	// See: https://github.com/ethereum/go-ethereum/pull/21083 (geth v1.9.15)
+	t.Run("RawErrorCode3", func(t *testing.T) {
+		entryPoint := kit.CalcFuncSignature("failRevertReason()")
+
+		request := fmt.Sprintf(`{
+			"jsonrpc": "2.0",
+			"id": 1,
+			"method": "eth_call",
+			"params": [{"to": "%s", "data": "0x%x"}, "latest"]
+		}`, contractAddrEth.String(), entryPoint)
+
+		statusCode, responseBody := client.DoRawRPCRequest(t, 1, request)
+		require.Equal(t, 200, statusCode)
+
+		var rpcResponse struct {
+			Error struct {
+				Code    int    `json:"code"`
+				Message string `json:"message"`
+				Data    string `json:"data"`
+			} `json:"error"`
+		}
+		require.NoError(t, json.Unmarshal(responseBody, &rpcResponse))
+		require.Equal(t, 3, rpcResponse.Error.Code,
+			"execution reverted error code must be 3 for Ethereum RPC compatibility (EIP-1474 de facto standard)")
+		require.NotEmpty(t, rpcResponse.Error.Data, "error response should include revert data")
+	})
 }
 
 // TestEthGetBlockReceipts tests retrieving block receipts after invoking a contract