The actress, who came out as a lesbian after splitting from long-time partner Danny Mozes in 2003, will be handed the Vito Russo Award at a New York ceremony.
The Vito Russo Award is named after a founding member of gay rights organisation the Gay & Lesbian Alliance Against Defamation (GLAAD), and presented to someone who has made “a significant difference in promoting equal rights for our community.”
GLAAD President Jarrett Barrios says, “Cynthia Nixon has been a vocal and visible advocate who has transformed cultural attitudes about our community. She is a perfect example of how sharing your personal story and speaking out for marriage equality can inspire change among fair-minded Americans. It is our privilege to honour her.”
The Broadway cast of the musical Hair will also be honoured in New York for its “commitment to raising visibility for marriage equality”.
Actor Alan Cumming will host the New York ceremony on 13 March. Ceremonies will also be held in Los Angeles and San Francisco, California.