Calvin Lockhart (born Bert McClossy Cooper) was a Bahamian–American stage and film actor.

Lockhart was perhaps best known for his roles as Reverend Deke O'Malley in the 1970 film Cotton Comes to Harlem and Biggie Smalls in the 1975 Warner Bros. film Let's Do It Again.

Lockhart was born Bert McClossy Cooper, the youngest of eight children in Nassau, Bahamas. Lockhart's father was Eric Cooper (1912/1913–1976), a Bahamian tailor. Lockhart moved to New York City, New York, when he was 18.

He spent one year at the Cooper Union School of Engineering, then left to pursue an acting career. He drove a taxi and operated a carpentry business in the borough of Queens while trying to establish a career as an actor.

In 1960, Lockhart made his Broadway debut, playing a gang leader in The Cool World (a dramatization of Warren Miller's novel of the same name), which closed after just two performances. Lockhart then traveled to Italy and formed his own theater company in which he both acted and directed, before moving to West Germany and then England, where he landed various roles on British television and small roles in films such as 1968's A Dandy in Aspic and Salt and Pepper.

Lockhart's first notable screen role was in Joanna, a 1968 film about an interracial romance, set in London. Joanna was directed by Michael Sarne, who subsequently cast Lockhart in the notorious Myra Breckinridge. Lockhart's first lead role in a film was in Halls of Anger (1970), playing a former basketball star who becomes vice-principal of an inner-city high school to which 60 white students are being moved.

He also starred in Cotton Comes to Harlem (1970, based on the Chester Himes novel of the same name) as the Reverend Deke O'Malley.

In 1974, Lockhart became an actor-in-residence at the Royal Shakespeare Company in Stratford-upon-Avon, England. In the 1980s he was a guest star for seven episodes in the prime-time soap opera Dynasty, playing Jonathan Lake. He is familiar to horror film fans after his performance as the millionaire big-game hunter in The Beast Must Die (1974).

Lockhart headed a Los Angeles campaign called "Getting Off Drugs," an anti-drug effort to get teenagers off drugs in the late-1970s. Lockhart returned to the Bahamas in the late 1990s and worked as a director on several productions of the Freeport Players Guild. Lockhart's last film role was in Rain, a movie that was shot in the Bahamas and was released in 2007. Lockhart died on March 29, 2007, in a Nassau hospital from stroke-related complications, at the age of 72.

Lockhart was married four times and had two sons.

In 1972, he married Jamaican model Thelma Walters; they divorced in 1978.

In August 1982, Lockhart married British businesswoman Lynn Sloan in the Bahamas; they later divorced. Calvin met his fourth and final wife Jennifer Miles in 1979 which led to the birth of actor Julien Lockhart Miles in 1981. The couple officially married 25 years later in 2006, with Julien walking his Mom down the aisle. In addition to Julien, Lockhart has another son named Leslie Lockhart.

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