Abraham Kingsley "King" Macomber (March 7, 1874 – October 6, 1955) was an American adventurer, businessman, philanthropist, Thoroughbred-racehorse owner and breeder. He was born in Morristown, New Jersey, the second of the three sons of Henry Kirke Macomber, a medical doctor who moved his family to Pasadena, California, in 1883.