William Martin Green, known by his stage name, Martyn Green, was an English actor and singer. He is remembered for his performances and recordings as principal comedian of the D'Oyly Carte Opera Company, in the leading patter roles of the Gilbert & Sullivan comic operas in the 1930s and 1940s, and for his career in America from the 1950s to the 1970s.

The D'Oyly Carte Opera Company is a professional British light opera company that, from the 1870s until 1982, staged Gilbert and Sullivan's Savoy operas nearly year-round in the UK and sometimes toured in Europe, North America and elsewhere. The company was revived for short seasons and tours from 1988 to 2003, and since 2013 it has co-produced four of the operas with Scottish Opera.