Battlefield is the first serial of the 26th season of the British science fiction television series Doctor Who, which was first broadcast in four weekly parts on BBC1 from 6 to 27 September 1989. It was the last to feature Nicholas Courtney as Brigadier Lethbridge-Stewart in Doctor Who.

William Nicholas Stone Courtney was an Egyptian-born British actor. He was best known for his long-running role as Brigadier Lethbridge-Stewart in the BBC science fiction television series Doctor Who.