Nicholas Owen Martin (born 26 June 1946) is an English former rugby union international.
Martin was born in Cambridge and attended The Perse School.
A Cambridge University blue, Martin played club rugby for Bedford and Harlequins, mainly as a lock. He gained his only England cap in the 1972 Five Nations, as a replacement for flanker Tony Neary late in the match against France at Colombes. In 1973, he was on the England squad for the tour of New Zealand.
Martin had a career in local government.