Cluedo, known as Clue in North America, is a murder mystery game for three to six players that was devised in 1943 by British board game designer Anthony E. Pratt. The game was first manufactured by Waddingtons in the United Kingdom in 1949. Since then, it has been relaunched and updated several times, and it is currently owned and published by the American game and toy company Hasbro.

Murder mystery games are a genre of party games. One of the players secretly plays a murderer, while other players must determine who among them is the criminal. Murder mystery games often involve actual 'murders' of guests throughout the game, or open with a 'death' and have the rest of the time devoted to investigation.