The Gay and Lesbian Alliance Against Defamation will honor the singer with its Davidson/Valentini Award at the San Francisco ceremony on 11 May.
The accolade is named after GLAAD’s first executive director Craig Davidson and his partner, Michael Valentini. It is presented to media professionals who have made a “significant difference in promoting equality for the LGBT community,” according to the organization's website.
“Adam Lambert's continued success as one of the world's best-selling pop stars shows LGBT people that they can be themselves and make it in a mainstream industry that many feel unfairly rejects them,” Wilson Cruz, actor and GLAAD spokesman, said in a statement.
“Adam is fearless on stage and astonishes audiences in every country he performs in.”
Lambert, who remained closeted during his stint at American Idol, came out publicly shortly after in an interview with Rolling Stone magazine in 2008. In 2012, he became the first openly gay artist to have an album debut at number one on the Billboard top 200 chart.
Previous Davidson/Valentini winners include director Lee Daniels (Precious), actors Chad Allen, Alec Mapa, B.D. Wong, and Sandra Bernhard, and The L Word creator Ilene Chaiken.