Rancho Cucamonga
- This article refers to the land grant. For the city of Rancho Cucamonga, see Rancho Cucamonga, California
Rancho Cucamonga was a 13,045-acre (52.79 km) Mexican land grant in present-day San Bernardino County, California given in 1839 to dedicated soldier, smuggler and politician, Tiburcio Tapia by Mexican governor Juan Bautista Alvarado. The grant encompassed present-day Rancho Cucamonga. The rancho extended easterly from San Antonio Creek to what is now Turner Avenue (Hermosa), and from today's Eighth Street to the mountains.