Mary Testa (born 4 June 1955) is an American stage actress. She is a two-time Tony Award nominee, for performances in revivals of 42nd Street (2001) and Leonard Bernstein's On the Town (1998).

She made her debut as Miss Goldberg in William Finn's one-act musical In Trousers (1979), part one of his "Marvin Trilogy," winning audiences over with her rendition of "Set Those Sails" and "I Am Wearing a Hat," as well as "The Rape of Miss Goldberg by Marvin." She returned to Broadway in July, 2007 in the musical-theater remake of the 1980 film Xanadu.

She is a frequent collaborator with such acclaimed musical dramatists as William Finn (Infinite Joy, A New Brain, In Trousers) and Michael John LaChiusa (Marie Christine, See What I Wanna See, First Lady Suite), while also having made outings in the works of Stephen Sondheim, Kander & Ebb, Flaherty & Ahrens, and Leonard Bernstein, among others. She is also a frequent soloist in the Broadway by the Year concert series and the Broadway Unplugged! concert series.

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