Fonejacker is a British comedy programme broadcast on E4 featuring a series of prank calls involving a number of different characters performed by British Iranian television actor Kayvan Novak. It first appeared in May 2006 and became a full series in 2007.

In 2005 Kayvan Novak and Ed Tracy created, wrote and directed Fonejacker, a prank call show, as part of Channel 4 Comedy Lab. After making the pilot together they were given a Christmas special and a six-part series which began airing in the UK on 5 July 2007 on E4 and lasted 6 episodes. They went on to make a second series which began airing on 17 September 2008 on E4, and started on Channel 4 on 6 November 2008. Kayvan Novak said that he was "not sure there will be a third series of Fonejacker" but despite this, several websites reported in October 2009 that a third series would air in May 2010.

In November 2009, the third series was officially announced, with the news that it would be called "Fonejacker 3D" and feature Kayvan Novak portraying both old and new Fonejacker characters face-to-face in the public domain. Renamed Facejacker, the new show began airing on 16 April 2010.

Fonejacker won the BAFTA award for the "Best Comedy Programme" in 2008. Novak plans to create a film based on the show's characters, and is currently in talks with Film4 and Hat Trick Productions.