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

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