The Fast Show, also known as Brilliant in the United States, is a BBC comedy sketch show that ran on BBC 2 from 1994 to 1997, with specials in 2000 and 2014. The show's central performers were Paul Whitehouse, Charlie Higson, Simon Day, Mark Williams, John Thomson, Arabella Weir and Caroline Aherne. Other significant cast members included Felix Dexter, Paul Shearer, Rhys Thomas, Jeff Harding, Maria McErlane, Eryl Maynard, Colin McFarlane and Donna Ewin.

Loosely structured and reliant on character sketches, running gags and many catchphrases, its fast-paced "blackout" style set it apart from traditional sketch series because of the number and relative brevity of its sketches; a typical half-hour TV sketch comedy of the period might have consisted of nine or ten major items, with contrived situations and extended setups, whereas the premiere episode featured 27 sketches in 30 minutes, with some items lasting less than ten seconds and none running longer than three minutes. Its style and presentation influenced many later series such as Little Britain and The Catherine Tate Show.

The show was released on VHS, DVD and audio CD. Some of its characters, such as Ted and Ralph and Swiss Toni, have had their own spin-off programmes. It also produced two national tours, the first in 1998, with the cast of the BBC surrealist comedy quiz show Shooting Stars, and the second, their Farewell Tour, in 2002. Higson announced on 5 September 2011 that The Fast Show would return for a new, online-only series.

The series was later shown as two 30-minute parts rather than the original eleven short episodes as part of a 50th birthday celebration for BBC2, the channel on which it originally aired.

The cast is reuniting for a 30th anniversary live tour in 2024.