Maxwell may refer to:
- Maxwell (NPC), a non-playable character in the game who acts as the main antagonist of the Characters and spawns at the start of each new world.
- Maxwell (character), a playable character in the game after he is freed from the Nightmare Throne after completing Adventure Mode.
- William Carter, a nonplayable character in the ARG puzzles made by Klei.
Using the Console code ("maxwell") will spawn in the Maxwell seen at the start of a world.
Using the code ("waxwell") will spawn the player character version of Maxwell.