Kelso (April 4, 1957 - October 16, 1983) was an American thoroughbred race horse and is considered to be among the best racehorses of the Twentieth century. In the list of the top 100 U.S. thoroughbred champions of the 20th Century by Blood-Horse magazine, Kelso ranks 4th, behind only Man O' War (1st), Secretariat (2nd), and Citation (3rd).