Quantum is an abstract strategy board game for two players, invented by Philip Slater and published by Lazy Days in 1975.

The game is played on a rectangular 12 by 8 board with an outer ring of coloured squares.

For a shorter game, the ring of coloured squares can be ignored to create a 10 by 6 or an 8 by 8 board.

Rod Rivers reviewed Quantum for Games and Puzzles magazine, writing that patience was needed to play as "the game has a very slow build up to what is often not very much of a climax."

The magazine's review panel rated the game as complex and highly dependant on skill.