A Fantastic Fear of Everything is a 2012 British horror comedy film starring Simon Pegg, written and directed by Crispian Mills with Chris Hopewell as co-director. It is based on the novella Paranoia in the Launderette by Bruce Robinson, writer and director of Withnail and I. It has been described as a low-budget "semicomedy" about a children's author-turned-crime-novelist who has become obsessed with murder and murdering. It was released on 8 June 2012 in the United Kingdom and Ireland, and received a limited U.S. theatrical release on 7 February 2014. The BBFC classified the film a 15 certificate in the UK, while the MPAA rated the film R in America.

Principal photography began on 6 July 2011. Filmed at Shepperton Studios, the film was the first to be backed by Pinewood Studios' initiative to support low-budget British films. It was released by Universal Pictures in the UK and Indomina Releasing in the US.