"Cold War" is the eighth episode of the seventh series of the British science fiction television series Doctor Who. It first aired on BBC One on 13 April 2013, and was written by Mark Gatiss and directed by Douglas Mackinnon.

The seventh series of the British science fiction television programme Doctor Who was broadcast concurrently on BBC One in the United Kingdom, and was split into two parts as the previous series had been. Following its premiere on 1 September 2012, the series aired weekly with five episodes until 29 September. The remaining eight episodes were broadcast between 30 March and 18 May 2013. The 2012 Christmas special, "The Snowmen", aired separately from the main series and introduced a new TARDIS interior, title sequence, theme tune, and outfit for the Doctor.