Rancho Solis was a 8,875-acre (35.92 km2) Mexican land grant in present day Santa Clara County, California given in 1834 by Governor José Figueroa to Mariano Castro. Solis means sun in Spanish. The grant extended along Uvas Creek between present day Gilroy and Mount Madonna.
The two square league Rancho Soliswas granted to Mariano Castro.
With the cession of California to the United States following the Mexican-American War, the 1848 Treaty of Guadalupe Hidalgo provided that the land grants would be honored. As required by the Land Act of 1851, a claim for Rancho Solis was filed with the Public Land Commission in 1853, and the grant was patented to Rufina Castro in 1859.
- Ogden Hoffman, 1862, Reports of Land Cases Determined in the United States District Court for the Northern District of California, Numa Hubert, San Francisco
- Diseño del Rancho Solis
- Early Santa Clara Ranchos, Grants, Patents and Maps
- United States. District Court (California : Northern District) Land Case 405 ND
- Report of the Surveyor General 1844 - 1886
- Eugene T. Sawyers, 1922, History of Santa Clara County,California, Historic Record Co.