A slot is a narrow opening or groove, usually in wood, metal, or plastic. It can also refer to a position or positional device in a computer, especially an expansion slot for an ISA (Industry Standard Architecture), PCI (peripheral component interconnect) or AGP (accelerated graphics port) card. A slot may also describe a set of sockets in a motherboard that hold memory chips, video cards or other components.

The term slot may also refer to:

In the United States, slot is generally used to describe a casino game that uses reels to produce random combinations of symbols. These combinations then determine if the player wins or loses. The odds of winning a slot machine jackpot will vary from machine to machine and are one of the biggest attractions for players. Casinos offer incentives to players in order to encourage them to play slots rather than other types of games such as poker or blackjack. Often, this includes large jackpot payouts and other bonus features.