Melnea Agnes Cass (née Jones; June 16, 1896 – December 16, 1978) was an American community and civil rights activist.

As a young woman, Cass also assisted women with voter registration after the passage of the Nineteenth Amendment.

The family moved to the South End of Boston when Cass was five years old from Richmond, Virginia.

As a young woman, she attended William Monroe Trotter's lectures and protest meetings and was a faithful reader of the Boston Guardian.

It was in the 1930s that Melnea Cass began a lifetime of volunteer work on the local, state, and national level.

During World War II she was one of the organizers of Women In Community Service, which later became Boston's sponsor of the Job Corps.

From 1962 to 1964, Cass was president of the Boston branch of the National Association for the Advancement of Colored People (NAACP).

She was honored by then-Massachusetts Attorney General, Edward W. Brooke, on May 22, 1966, which was declared Melnea Cass Day.