Blue Larkspur (1926–1947) was a bay Kentucky-bred thoroughbred race horse. He was inducted into the National Museum of Racing and Hall of Fame in 1957, and ranks Number 100 in Blood-Horse magazine's top 100 U.S. thoroughbred champions of the 20th Century. Of the 127 stakes winners bred by Colonel Edward Riley Bradley at his Idle Hour Stock Farm in Lexington, Kentucky – which includes Bimelech out of La Troienne – Blue Larkspur was considered the Colonel's finest horse.