Blind man's bluff is a children's game played in a spacious enclosed area, such as a large room, in which one player, designated as It, is either blindfolded or closes his or her eyes. The It player gropes around blindly and attempts to touch the other players without being able to see them, while the other players scatter and try to avoid and hide from the It player. The game is a variant of tag.

Blind man's bluff can be played in an area free of dangerous obstructions so that the player will not suffer injury from tripping over or hitting something.

The game was played at least as far back as the Victorian era when it was a popular parlor game.