Betrayal at House on the Hill is a board game published by Avalon Hill. Players all begin as allies, exploring a haunted house filled with dangers, traps, items and Omens. As players explore the mansion, new room tiles are chosen at random; accordingly, the game board is different each session.

Whenever an Omen is revealed there is a chance that "the Haunt" will begin: one of the players will change allegiance and combat the other players in some horror scenario. Each scenario is different—the traitor may end up controlling (or becoming) zombies, cannibals, dragons, vampires, the house itself, or almost any other monster imaginable. The goals for winning also change—the remaining players may need to kill the monster(s), kill the traitor, survive for a number of rounds, or achieve some other goal for winning.

The traitor's goal is usually to kill the other players first, but occasionally the traitor can win by other means. The traitor and the remaining heroes receive different information about the scenario and may not be aware of what their opponent's goal is. Both sides pursue their goals in the second part of the game until one side defeats the other.

Because the original rules are sometimes unclear or indeterminate, extensive errata has been released and made freely available (see below). Betrayal at House on the Hill won the 2004 Gamers Choice Award for Best Board Game.

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