Martin Sixsmith (born 24 September 1954) is a British author and radio/television presenter, primarily working for the BBC. He has also worked as an adviser to the Labour government and to the BBC television comedy series The Thick of It. Sixsmith's book about Philomena Lee, The Lost Child of Philomena Lee, was the basis for the 2013 film Philomena, in which Sixsmith is played by Steve Coogan.