Muir Beach is a census designated place (CDP), unincorporated community, and beach on the Pacific Ocean. The community is located 16.5 miles (26.6 km) northwest of San Francisco in western Marin County, California, United States. Unlike many other entities in the area, it is not named directly in honor of conservationist John Muir; instead, it was named after Muir Woods National Monument to capitalize on the latter's popularity. The population was 304 at the 2020 census. The community itself flanks the northwest side of the beach.

Tamalpais High School is a public secondary school located in Mill Valley, California, in the San Francisco Bay Area. It is named after nearby Mount Tamalpais, which rises almost 2,500 feet (760 m) above Mill Valley.