Fetters Hot Springs-Agua Caliente is a census-designated place (CDP) in Sonoma Valley, Sonoma County, California, in the United States. As of the 2010 census, the CDP population was 4,144. The name Agua Caliente translates into English, from Spanish, as hot water, referring to the hot springs historically found in the area.

Sonoma Valley is a valley located in southeastern Sonoma County, California, in the North Bay region of the San Francisco Bay Area. Known as the birthplace of the California wine industry, the valley is home to some of the earliest vineyards and wineries in the state, some of which survived the phylloxera epidemic of the 1870s and the impact of prohibition in the early 20th century. Today, the valley's wines are promoted by the U.S. federal government's Sonoma Valley and Carneros AVAs.