E4 is a channel on British digital television, launched as a pay-TV companion to Channel 4 on 18 January 2001. The "E" stands for entertainment, and the channel is mainly aimed at the lucrative 15–35 age group. Programming includes US imports such as The O.C., Smallville, Veronica Mars, The Cleveland Show, Glee, Everwood, What About Brian?, Desperate Housewives, How I Met Your Mother, 90210,One Tree Hill, Scrubs, Rules of Engagement, The Big Bang Theory and formerly Friends. Other programming includes British shows such as Shameless, Hollyoaks, Skins, The Inbetweeners and Misfits. Some of the imports, e.g. Desperate Housewives and Ugly Betty are screened on E4 up to one week ahead of their Channel 4 broadcasts. Its most successful broadcast to date was on 11 October 2010 when an episode of The Inbetweeners pulled in over 3.7 million viewers. E4 uses the voiceover of Peter Dickson to advertise its programmes.

On 16 December 2004, Channel 4 announced that the subscription channel would return to digital terrestrial television. From its launch until the closure of ITV Digital it was available as a bonus subscription channel. It became part of the Top Up TV subscription scheme until 27 May 2005, when the channel became available on Freeview, with the potential to increase advertising revenue by attracting a larger audience.

Channel, Channels, and similar terms may refer to: