Elliott R. Blackstone (November 30, 1924 – October 25, 2006) was a sergeant in the San Francisco Police Department, known as a longtime advocate for the lesbian, gay and transgender community in that city.

[1] Born in Aurora, Illinois and raised in Chinook, Montana, Blackstone served in the U.S. Navy during World War II, and was honorably discharged.

[3] Blackstone worked within the police department to change policy and procedures directed against the LGBT community, such as entrapment of gay men in public restrooms.

[6] In the months following the Compton's Cafeteria Riot, Blackstone participated in efforts by the Tenderloin neighborhood organizing campaign to establish the Central City Anti-Poverty Program,[5] as part of the War on Poverty under President Lyndon B.

[5] Blackstone's introduction to advocating for the transgender community occurred when Louise Ergestrasse came into his office with a copy of The Transsexual Phenomenon by Harry Benjamin and demanded he do something for "her people."

[5] Blackstone avoided prosecution but was removed from his role serving the transgender community, and reassigned to a foot patrol in a different district, where he remained until retiring in 1975.

[5] According to one source,[3] At the 2005 world premiere at the Castro Theater, Blackstone received a standing ovation from a sold-out crowd of more than 1000 people, when he answered an audience member's question; asked why, as a straight man, he had worked so hard on behalf of LGBT rights, he said, "Because my religion teaches me to love everybody.