Susan Douglas McGreivy (née Gray; October 24, 1939 – November 30, 2019) was an American competition swimmer who represented the United States at the 1956 Summer Olympics in Melbourne, Australia.

[2] She competed in the preliminary heats of the women's 400-meter freestyle, and posted a time of 5:16.7.

[2][3] McGreivy became a lesbian activist and civil rights attorney for the American Civil Liberties Union (ACLU) of Southern California.

[4][5] She had a "leading role" in a range of ACLU gay and lesbian civil rights issues, including a case against the Boy Scouts of America, a defense of the Gay Games against the United States Olympic Committee, and defense of the Norton Sound Eight.

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