Martin John Kemp (born 10 October 1961) is an English actor, musician, and director, known as the bassist in the new wave band Spandau Ballet and for his role as Steve Owen in EastEnders.

He is the younger brother of Gary Kemp, who is also a member of Spandau Ballet and an actor. In 2012, Kemp finished third in the tenth series of Celebrity Big Brother, and in 2017 he appeared as a judge on the BBC series Let It, Shine.