Madge Dorita Sinclair, born Madge Dorita Walters (April 28, 1938 in Kingston, Jamaica— December 20, 1995 in Los Angeles, California) was an Emmy-winning Jamaican American actress.

Sinclair received an Emmy Award nomination for her role as Belle in the miniseries Roots. She went on to a long-running stint in the 1980s as nurse Ernestine Shoop on the series Trapper John, M.D. opposite Pernell Roberts. She received three Emmy nominations for her work on the show, and critic Donald Bogle praised her for "maintaining her composure and assurance no matter what the script imposed on her."

In 1988, Sinclair played Queen Aoleon opposite James Earl Jones' King Jaffe Joffer in the Eddie Murphy comedy Coming to America. Later, she would reteam with Jones as King and Queen for the role of Sarabi, Simba’s mother, in the blockbuster Disney animated film The Lion King (1994). The film became one of the best selling titles ever on home video. The two also collaborated on the series Gabriel's Fire, which earned Sinclair an Emmy in 1991 for Best Actress in a Dramatic Series.

Sinclair, in her brief role as the captain of the USS Saratoga in Star Trek IV: The Voyage Home, was the first black and female captain to appear in Star Trek. Years later, she played Geordi La Forge's mother, captain of the USS Hera, in Star Trek: The Next Generation ' s "Interface".

Madge Sinclair died in 1995 of leukemia. She was buried in her native Jamaica.

Madge Sinclair married young, and had two sons. She worked as a teacher in Jamaica until she was 30. Madge left her two boys with their father and went to New York to be an actress. She began modelling and later acted with the New York Shakespearean Festival and at Joseph Papp's Public Theatre. In 1974 Madge made her film debut in 1974, playing Mrs. Scott in Conrack (1974). Madge was nominated for an Emmy Award for her performance as Belle in the miniseries _"Roots" (1977)_. In the early 1980s, shortly after joining the cast of "Trapper John, M.D." (1979) she was diagnosed with leukaemia. She continued to work outliving the doctors' predictions by several years. On December 20, 1995, at the age of 57, Madge Sinclair died in Los Angeles.