He was born in East Sussex, England, and attended Sherborne public school. He married actress Gwyneth Paltrow on December 5, 2003. A daughter, Apple Blythe Alison Martin was born on 14th May 2004.
Martin has been particularly outspoken on issues of Fair Trade and Globalisation as well as a critic of President George W. Bush and the war in Iraq. He has done a great deal of campaigning for the charity Oxfam. When performing, he usually has the words 'make trade fair.com' written on his left hand.