The Miami-based SAVE group, formed in 1993, said it was supporting the Miami Democrat because of his work advocating equality.
"During his term as congressman, Joe served South Florida's LGBTQ community admirably, garnering SAVE's Champion of Equality Award in 2013 for his sponsorship of the Federal Employment Non-Discrimination Act and his efforts to protect LBGT immigration rights," SAVE said in a statement.
Long before joining the House in January 2013, the group noted that Garcia had led the Cuban American National Foundation, which he then headed, in opposing the repeal of Miami-Dade's human-rights ordinance.
Once in Congress, Garcia served as vice chairman of the LGBT Equality Caucus. He helped pass bipartisan legislation reauthorizing the Violence Against Women Act, which extended protects against rape and domestic violence to members of the LBGT community.
"One of my guiding principles is that every person should be treated equally," Garcia said Thursday. "That's why I'm honored that SAVE would recognize my work in support of the LGBTQ community."
SAVE's endorsement of Garcia came six days after Log Cabin Republicans, an influential GOP gay-rights group, endorsed Reps. Ileana Ros-Lehtinen and Carlos Curbelo of South Florida in their re-election races, along with five other incumbent lawmakers from across the country.