"The End of Time" is a two-part story of the British science fiction television series Doctor Who, originally broadcast in the United Kingdom on BBC One on 25 December 2009 and 1 January 2010. It is the fifth Doctor Who Christmas special and the last entry in a series of specials aired from 2008 to 2010. It marks the final regular appearance of David Tennant as the Tenth Doctor and introduces Matt Smith as the Eleventh Doctor. At the time, it was the last Doctor Who story written and produced by Russell T Davies, who shepherded the series' return to British television in 2005 and served as the series's executive producer and chief writer, until he returned to the position in 2022 for the 60th anniversary specials onwards.

The 2008–2010 specials of the British science fiction television programme Doctor Who are series of five specials that linked the programme's fourth and fifth series. The specials were produced in lieu of a full series in 2009, to allow the new production team for the programme enough time to prepare for the fifth series in 2010, in light of Russell T Davies's decision to step down as showrunner, with Steven Moffat taking his place in the fifth series. Preceded by the 2008 Christmas Special, "The Next Doctor", the first special, "Planet of the Dead", was aired on 11 April 2009, the second special "The Waters of Mars", was aired on 15 November 2009, with the last special, the two-part episode "The End of Time", broadcasting over two weeks on 25 December 2009 and 1 January 2010.