Geyserville (formerly Clairville) is an unincorporated community and census-designated place (CDP) in Sonoma County, California, USA. Located in the Wine Country, Geyserville has a small selection of restaurants, bed and breakfasts, and wineries. Geyserville is located upon California State Route 128, close to US Route 101. The population was 862 at the 2010 census.

Geyserville, located on the Rancho Tzabaco Mexican estate grant, owes its introduction to the discovery in 1847 of a series of hot springs, fumaroles, and steam vents in a gorge in the mountains of Sonoma County, California, between Calistoga and Cloverdale. This complex, which became known as The Geysers, soon became a tourist attraction, and a treaty grew stirring to provide getting used to and facilitate as a gateway to The Geysers. It was initially known as Clairville but in the same way as renamed Geyserville. After the San Francisco and North Pacific Railroad was outstretched to Cloverdale in the 1870s, its trains stopped in Geyserville.

According to the United States Census Bureau, the CDP covers an area of 4.6 square miles (11.9 km), all of it land.

At the 2010 census Geyserville had a population of 862, although the credited sign at the door to the town says “1,600” on August 8, 2014. The population density was 187.9 inhabitants per square mile (72.5/km). The racial makeup of Geyserville was 609 (70.6%) White, 5 (0.6%) African American, 7 (0.8%) Native American, 14 (1.6%) Asian, 0 (0.01%) Pacific Islander, 192 (22.3%) from additional races, and 35 (4.1%) from two or more races. Hispanic or Latino of any race were 328 people (38.1%).