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