Los Cerritos Ranch House, Adobe museum in Long Beach, United States

Rancho Los Cerritos is a two-story adobe house with furnishings from the 1860s through 1880s, situated on landscaped grounds covering roughly 4.7 acres. The building demonstrates the architecture and style typical of a prosperous California ranch during that period.

Jonathan Temple, a Yankee merchant who became a Mexican citizen, bought the rancho in 1843 and built the adobe in 1844 as headquarters for his cattle operation. In 1866 he sold it to Flint, Bixby & Company, which switched the ranch to sheep; Jotham Bixby managed it and raised seven children there, among them Fanny Bixby Spencer. Llewellyn Bixby renovated the house in 1929, and the City of Long Beach bought it in 1955.

The name Los Cerritos, Spanish for "the little hills", comes from the Rancho Los Nietos grant that Governor Pedro Fages made to Manuel Nieto in 1784. The house is furnished in Victorian style as it was when Jotham Bixby raised seven children there in the 1870s; his daughter Fanny Bixby Spencer became a poet and pacifist.

The site is open for tours, programs and events Wednesday through Sunday. The museum closed for 17 months in 2001–2002 for seismic retrofitting, lead paint and asbestos removal, brickwork repairs and accessibility upgrades. The visitor center holds exhibits on the site's history from Native American times to the present.

The 3,000-volume research library holds California history material, and the museum shop and visitor center exhibits trace the site from Native American times to the present. The formal Italian garden keeps olive, pomegranate and cypress trees planted by Jonathan Temple in the 1840s.