Spider is a type of patience game, and is one of the more popular two-deck solitaire games. The game originates in 1949, and its name comes from a spider's eight legs, referencing the eight foundation piles that must be filled to win the game.

The earliest printed reference of the world solitaire the game appeared in 1746, according to the Oxford English Dictionary (OED). However, this probably refers to peg solitaire, a board game played with marbles and pegs.