Nancy Dussault (born June 30, 1936 in Pensacola, Florida) is an American singer and actress. She grew up as a "Navy junior". A former resident of Arlington, Virginia, she graduated from Washington-Lee High School (W-L) where she was an actress and singer in the formidable W-L drama program under director Jack Jeglum and a choral singer in the nationally known Washington-Lee High School Choir and Madrigal Singers under director Florence Booker.

In 1962, Dussault stepped into the role of Maria in the Broadway production of The Sound of Music. She received a Tony Award nomination in 1961 for Best Featured Actress (Musical) for Do Re Mi and was nominated for her performance in Bajour (1965). She appeared in the City Center Gilbert & Sullivan NYC Company, directed by Dorothy Raedler, with such Metropolitan Opera singers as Nico Castel, Muriel Costa-Greenspon, and Frank Poretta, Sr.

On television, she was a regular on the 1970s series The New Dick Van Dyke Show, and played Ted Knight's wife in the role of Muriel Rush on the 1980s situation comedy Too Close for Comfort.