Martin Duffy (born 25 August 1952 in Dublin) is an Irish filmmaker and writer.

Starting as a film-editor at Radio Telefís Éireann in the late 1970s, he expanded into writing children's shows in the 1980s with the Lambert Puppet Theatre, Wanderly Wagon, Fortycoats & Co., Bosco and Scratch Saturday.

He left Irish national television in 1989 to become a freelance editor and in 1995 found funding for his first feature film, The Boy from Mercury, a film set in 1950s Dublin about a young boy whose life revolves around the escapism of Saturday afternoon Flash Gordon serials at his local cinema.

The film received international critical acclaim and several awards, but was a commercial dud.

He continues to work as a freelance editor when he is not directing, and has written several books for children, as well as a travelogue and a family history.