The San Marcos Stakes is an American Grade II Thoroughbred horse race held annually in late January or early February at Santa Anita Park in Arcadia, California. Open to horses aged four and older, it is raced on turf over a distance of one and one-quarter miles. Inaugurated in 1952 as a one-mile race on dirt, in 1954 it was changed to one and one-quarter miles and became Santa Anita Park's first graded stakes race on turf. It was raced on dirt again in 1956, 1962, 1969, 1973, 1975, 1978 through 1983, and in 1996.