Inside No. 9 is a British black comedy anthology television programme written and created by Steve Pemberton and Reece Shearsmith. It aired on BBC Two from 5 February 2014 to 12 June 2024, running for 9 series and 55 episodes. Each 30-minute episode is a self-contained story with new characters and a new setting, almost all starring Pemberton or Shearsmith (usually both). Aside from the writers, each episode has a new cast, allowing Inside No. 9 to attract a number of well-known actors. The stories are linked only by a setting related to the number 9 in some way, and a brass hare statue that is hidden in all episodes. Themes and tone vary from episode to episode, but all have elements of comedy and horror or perverse humour, in addition to a plot twist.

Inside No. 9 as a whole has been very well received by critics, holding a 100% rating on Rotten Tomatoes. Critics have praised the humour and creativity of the scripts, as well as the talent of the featured actors.

In May 2024, it was announced that Pemberton and Shearsmith had adapted the television series into a West End stage play, titled Inside No. 9 Stage/Fright. Both will be performing in the production, which premiered in January 2025, at the Wyndham's Theatre, London.

A one-hour documentary, Inside No. 9: The Party's Over, aired on BBC One on 22 December 2024. The documentary gave a behind-the-scenes look at filming the last ever series, plus interviews with cast and crew from the nine series.