Cotati (; Miwok: Kota’ti) is an incorporated city in Sonoma County, California, United States, located approximately 45 mi (70 km) north of San Francisco in the 101 corridor between Rohnert Park and Petaluma. Cotati's population as of the 2020 Census was 7,584, making it the least populous incorporated community in Sonoma County.
Like all of Sonoma County, Cotati is included in both the San Francisco Bay Area and North Coast. Located in the Sonoma Coast AVA, Cotati can also be considered part of Wine Country. E & J Gallo Winery operates a 400-acre (160 ha) vineyard called Two Rock Vineyard in the hills west of town. Cotati's hexagonal downtown plaza, one of only two hexagonal town layouts in the United States, is California Historical Landmark number 879. The other U.S. city with a hexagonal layout is Detroit, Michigan.