Quark can mean more than one thing:

• A subatomic particle
• A nonce word in James Joyce's Finnegans Wake
• A soft cheese
• A character in the American Star Trek television series Star Trek: Deep Space Nine, also appearing in Star Trek: Voyager and Star Trek: The Next Generation.
• A character in a Danish series, which tells of the adventures of Thor in an European comics format
• A software manufacturer, best known for the page layout software QuarkXPress.
• An operating system kernel
• A type of robot employed by the alien Dominators in the British television series Doctor Who.
• A chess engine
• A kind of creatures in a CG animated seria "Les Quarks" (1991) created by Benayoun, Schuiten and Peeters and made for 35mm release by Z.A. Productions.
• A 1978 short-lived U.S. television sitcom starring Richard Benjamin as the captain of a garbage spaceship.
• A multi-purpose tool under GPL for the games using engines similar to or based on the Quake series game engine by id Software. QuArK is an abbreviation for Quake Army Knife.
• A popular science and puuzzle magazine, now out of print