Jackson DeForest Kelley (January 20, 1920 – June 11, 1999) was an American actor, screenwriter, poet and singer known for his iconic roles in Westerns and as Dr. Leonard "Bones" McCoy of the USS Enterprise in the television and film series Star Trek.

Kelley was delivered by his uncle at his parents' home in Atlanta, the son of Clora (née Casey) and Ernest David Kelley, who was a Baptist minister of Irish and Southern ancestry. DeForest was named after the pioneering electronics engineer Lee De Forest, and later named his Star Trek character's father "David" after his own. Kelley had an older brother, Ernest Casey Kelley. As a child, he often played outside for hours at a time. Kelley was immersed in his father's mission in Conyers and promised his father failure would mean "wreck and ruin". Before the end of his first year at Conyers, Kelley was introduced into the congregation to his musical talents and often sang solo in morning church services. Eventually, this led to an appearance on the radio station WSB AM in Atlanta, Georgia. As a result of his radio work, he won an engagement with Lew Forbes and his orchestra at the Paramount Theater.