Ada C. Bello (November 6, 1933 – March 31, 2023) was a Cuban-American LGBT rights activist and medical laboratory researcher of Portuguese descent.

[5][8] Bello's advocacy efforts in the late 1960s and early 1970s served as a "bridge between pre- and post- stonewall political activities.

[10] In 1980, Bello and fellow LGBT activists Mark Segal and John Cunningham traveled to Fort Indiantown Gap, Pennsylvania along with Spanish-speaking volunteers from the Metropolitan Community Church to assist a group of LGBT refugees from Cuba on the Mariel boatlift, known generally as "Marielitos", to receive asylum and temporary housing with LGBT-friendly hosts in the United States as part of a settlement program initiated by President Jimmy Carter.

[11] Bello volunteered for the American Library Association's Gay Task Force under Barbara Gittings and was a supporter of the William Way LGBT Community Center where she served as co-chair.

[4][12][13] On July 4, 2015, Bello was one of the participants in the 50th Anniversary Celebration of the Reminder day protests and LGBT Civil Rights Movement, held at Independence Hall.

[1][2] Bello received the 2015 David Acosta Revolutionary Leader Award (DARLA) from the Gay and Lesbian Latino AIDS Education Initiative (GALAEI).

[12] In 2020, she received the Spirit of CARIE Award from the Center for Advocacy for the Rights of the Elderly for her work in advocating for LGBTQIA+ senior citizens in Philadelphia.