Martin Luther King III (born October 23, 1957) is an American human rights advocate and community activist. He is the eldest son and oldest living child of civil rights leader Martin Luther King, Jr. and Coretta Scott King. His siblings are Dexter Scott King, Rev. Bernice Albertine King, and the late Yolanda Denise King. King attended The Galloway School and went on to Morehouse College, which was the same school his father, his grandfather and his great-grandfather attended.

Martin Luther King III was born in October 23, 1957 to human rights advocate Martin Luther King, Jr. and Coretta Scott King. His mother had reservations about naming him after his famous father, "realizing the burdens it can create for the child," but King, Jr. always wanted to name his son Martin Luther III. He was raised in Vine City, an urban neighborhood in Atlanta, Georgia, and was ten years old when his father was assassinated. King lived with his mother in his childhood home until his adulthood. As an adult, King was a shy man who rarely socialized, and friends have claimed he tends to overwork, in part due to the pressure to live up to his father's name; one friend, Rev. E. Randel T. Osburn, said of King, “Watching him is like watching somebody trying to outrun themselves. It’s like there’s a ghost in front of him and he’s always trying to catch it.”

King served as an elected county commission member in Fulton County, Georgia, the county encompassing most of Atlanta, from 1987 to 1993. He was defeated for re-election after revealing that he owed the federal government more than $200,000 in back taxes and fines. Also in 1993, King helped found the Estate of Martin Luther King Jr. Inc., the company that manages the license of Martin Luther King Jr.'s image and intellectual property. King remains a commissioner in the company as of 2008.