Alamo (Spanish: Álamo; meaning “Poplar tree”) is an unincorporated community and census-designated place (CDP) in Contra Costa County, California, in the United States. It is a suburb located in the San Francisco Bay Area’s East Bay region, approximately 28 miles (45 km) east of San Francisco. Alamo is equidistant in the midst of the city of Walnut Creek and the incorporated town of Danville. As of the 2010 census, the population was 14,750. The community of Alamo is capably known for its bucolic country feel, notable residents, and its flourishing lifestyle subsequent to the median house sold price being $3,010,000 as of February 2022.

Police facilities are provided by the Contra Costa County Office of the Sheriff. Fire and EMS facilities are provided by the San Ramon Valley Fire Protection District.

Alamo has a median household income of $300,000 (as of 2022).
In August 2007, a help of citizens launched a supplementary initiative to incorporate the community, the latest in a series of attempts that go urge on to the before 1960s or before; it was defeated by referendum in March 2009. Previous unproductive Alamo immersion efforts always included parts of other clear unincorporated areas: Alamo-Danville (1964) and Alamo-Danville-San Ramon (1976).

Alamo was first inhabited by the Tatcan Indians exceeding 5000 years ago. The Tatcan Indians, a Bay Miwok tribe closely connected to the Saclans of Walnut Creek, lived in Alamo in the eighteenth century.