Muir Woods National Monument is a United States National Monument managed by the National Park Service and named after naturalist John Muir. It is located on Mount Tamalpais near the Pacific coast in southwestern Marin County, California. The Monument is part of the Golden Gate National Recreation Area, and is 12 miles (19 km) north of San Francisco. It protects 554 acres (224 ha), of which 240 acres (97 ha) are old growth coast redwood forests, one of a few such stands remaining in the San Francisco Bay Area.

Mount Tamalpais, known locally as Mount Tam, is a peak in Marin County, California, United States, often considered symbolic of Marin County. Much of Mount Tamalpais is protected within public lands such as Mount Tamalpais State Park, the Marin Municipal Water District watershed, and National Park Service land, such as Muir Woods.