Margaret Harshaw (12 May 1909 – 7 November 1997) was an American opera singer and voice teacher who sang for 22 consecutive seasons at the Metropolitan Opera from November 1942 to March 1964. She began her career as a mezzo-soprano in the early 1930s but then began performing roles from the soprano repertoire in 1950. She sang a total of 39 roles in 25 works at the Met and was heard in 40 of the Metropolitan Opera radio broadcasts. She was also active as a guest artist with major opera houses in Europe and North and South America.