Juan E. Camarillo Jr. (April 10, 1867 – August 21, 1936) was a wealthy Californio landowner and philanthropist in Ventura County, California, United States. Juan and his elder brother Adolfo Camarillo lived in Casa Camarillo, and were involved in the mercantile business.[1] Camarillo and his brother owned Rancho Calleguas upon the death of their father.