Greg Stein (1948-2021) was an LGBTQIA+ rights and AIDs advocate in Queens. He served as a treasurer for the Queens Lesbian and Gay Pride Committee for more than two decades and was treasurer of the AIDS Center of Queens County nearly from its inception. Stein served on the board and volunteered for the Lesbian and Gay Democratic Club of Queens. In a 2018 Queens Memory Project oral history interview, Stein described how the experience of having friends with HIV inspired him to become an AIDS and LGBTQIA+ advocate.

Stein taught math at Russell Sage Junior High School in Forest Hills, was a member of the Phi Kappa Theta fraternity, and served as a lectern at Queen of Angels Church in Sunnyside.