Rancho Santa Rosa was a 13,184-acre (53.35 km2) Mexican land grant in present-day San Luis Obispo County, California.
It was given in 1841 by Governor Juan Alvarado to Julian Estrada.[1] The grant extended along the Pacific coast from San Simeon Creek on the north to the present-day town of Harmony on the south, and encompassed present-day Cambria.[2]