Sunol (Spanish: Suñol) is an unincorporated area and census-designated place in Alameda County, California.

Located in the Sunol Valley of the East Bay, the population was 922 at the 2020 census.

It is best known as the location of the Sunol Water Temple and for its historic tourist railroad system, the Niles Canyon Railway.

[7] The first Sunol post office opened in 1871 and the name was changed to Sunolglen the same year.

[8] The town's name is in honor of Antonio Suñol, first postmaster in nearby San Jose and part owner of the historical Rancho Valle de San Jose land grant that once contained the site of the town.

[8] Thomas Foxwell Bachelder had large farm in Sunol and sold land in 1884 that founded much of the town.

[9] [10] [11] Sunol is located adjacent to two railroads and lies near the crossroads of Interstate 680 and State Route 84.

These connect Sunol with Fremont to the south and west, Pleasanton to the north, and Livermore to the northeast.

The town lies near Alameda Creek at the northwest edge of the Sunol Valley.

According to the United States Census Bureau, the Sunol CDP has a total area of 28.6 square miles (74 km2), of which 98.8% is land and 1.2% is water.