Cat in a box or cat in the box may refer to:
Schrödinger's cat, a thought experiment concerning quantum superposition
Film and television Cat in the Box, a 1993 unreleased film by Valeria Golino "Cat in the Box", an episode of the television series You Me Her "Cat in the Box", an episode of the television series Super Wings
Literature "Cat in a Box", a short story by Gareth L. Powell in his 2008 short story collection The Last Reef and Other Stories The Cat in the Box, a 2019 book by Chris Ferrie
Music "Cat in a Box", a song by Morningwood from their 2009 album Diamonds & Studs "Cat in the Box", a 2015 parody song of "Man in the Box" by Chris Senter
Games Cat in a Box Games, the Canadian video game developer and publisher of Blue Defense Cat in the Box, a 2020 trick-taking card game
See also Letting the cat out of the bag, a colloquialism that means to reveal facts previously hidden Maru (cat), a cat who became popular for squeezing into small boxes