The rook (; ?, ?) is a piece in the game of chess. It may move any number of squares horizontally or vertically without jumping, and it may an enemy piece on its path; it may participate in castling. Each player starts the game with two rooks, one in each corner on their side of the board.

Formerly, the rook (from ) was alternatively called the tower, marquess, rector, and comes (count or earl). The term "castle" is considered