Rancho La Sierra (also called "La Sierra de Santa Ana") was a 17,774-acre (71.93 km2) Mexican land grant in present-day Riverside County, California, United States. In 1846 Governor Pio Pico issued the grant to Vicenta Sepulveda.[1] The rancho includes the present-day city of Norco, and the western end of Riverside.[2][3]