8 Out of 10 Cats Does Countdown is a British comedy panel show hosted by Jimmy Carr. It is a crossover of 8 Out of 10 Cats and game show Countdown. The show follows the format of Countdown, but with hosts and contestants from 8 Out of 10 Cats, and an emphasis on the humour seen on 8 Out of 10 Cats. All episodes are approximately 45 minutes long, and usually featured team captains Sean Lock and Jon Richardson; after Lock's death in 2021 his team has been led by a rotating series of guest captains while Richardson continues to be a regular captain (except when scheduling conflicts prevent him from appearing).

As of 16 August 2024, 162 episodes of 8 Out of 10 Cats Does Countdown have aired.