"Army of Ghosts" is the twelfth and penultimate episode in the second series of the British science fiction television programme Doctor Who which was first broadcast on BBC One on 1 July 2006. It is the first episode of a two-part story; the concluding episode, "Doomsday", was first broadcast on 8 July.

The second series of British science fiction programme Doctor Who began on 25 December 2005 with the Christmas special "The Christmas Invasion". A regular series of thirteen episodes was broadcast weekly in 2006, starting with "New Earth" on 15 April and concluding with "Doomsday" on 8 July. In addition, two short special episodes were produced; a Children in Need special and an interactive episode, as well as thirteen minisodes titled Tardisodes. It is the second series of the revival of the show, and the twenty-eighth season overall.