Martine St. Clair (born Martine Nault, 22 July 1962) is a Canadian singer from the province of Quebec. She has released numerous albums in a career that has spanned over two decades.

St. Clair was born in Montreal. In 1981, she was chosen by renowned Quebec lyricist Luc Plamondon to play the role of Cristal in the rock-opera Starmania. The following year, she recorded a duet with French singer Gilbert Bécaud called "L'amour est mort".

Her debut solo album in 1983, Coeur Ordinateur, would feature songs written by Plamondon.

She also recorded several duets or collaborated with other recording artists. She recorded the song "Closer Together" with Canadian new wave group The Box in 1986. In 1987, she recorded "Je l'aime" with Nicole Martin and "Tu peux pas" with Claude Dubois. In 1993, she recorded two cover versions of Canadian singer Gino Vannelli's 1979 song "Wheels of Life": one in French as "L'amour Est Loi"; and the second in English as a duet with Vannelli himself. Her musicians include guitarist Alexis Charrier, and pianist Sonny Lamson.

She received nominations for Female Vocalist of the Year and for Best Selling Single ("L'Amour est dans tes yeux") at the 1986 Juno Awards. The same year she won 4 Felix awards.