The following are known Action Replay Codes for Donkey Kong Country 3 on Nintendo Game Boy Advance (GBA).
These codes were also known as GameShark Codes and in most cases will work on both devices.

These codes are for the U.S. version of the game.

Master Code – Must Be On
daef2efc
f195d6e4
eb33074f
65a3c486

Invinicibility
17a01384
7e21e4bb

Infinite Lives
00de92e6
4aab28f2

Max Bananas
c5320597
f5168365

Infinite Silver Coins
e0e66e7a
e2f7deaa