Louis R. Rowan (September 27, 1911 - September 28, 1988) was an American businessman and Thoroughbred racehorse owner and breeder.A native of California, Rowan was educated in England. In 1968, along with Clement L. Hirsch and Dr. Jack Robbins, he co-founded the Oak Tree Racing Association at Santa Anita Park in Arcadia, California. Rowan was also a co-founder of the California Thoroughbred Foundation.Louis Rowan bred and raced a number of successful horses. Among them were: Mrs.