Tiburon is an incorporated town in Marin County, California. It occupies most of the Tiburon Peninsula, which reaches south into the San Francisco Bay. The smaller city of Belvedere (formerly a separate island) occupies the south-east part of the peninsula and is contiguous with Tiburon. Tiburon is bordered by Corte Madera to the north and Mill Valley to the west, but is otherwise surrounded by the Bay. The population was 8,962 at the 2010 census.
The city's name derives from the Spanish word tiburón, which means "shark". The name was first given to the peninsula on which the city is situated, and probably inspired by the prevalence of locally native leopard sharks in the surrounding waters. Tiburon was formerly the southern terminus of the Northwestern Pacific Railroad. This railroad carried freight, mostly lumber, to the town for transfer to barges for shipping to cities around San Francisco Bay. It is now a commuter and tourist town, linked by fast ferry services to San Francisco and with a concentration of restaurants and clothes shops. It is the nearest mainland point to Angel Island and a regular ferry service connects to the island.
The former railroad right of way now forms part of the San Francisco Bay Trail, used by hikers and cyclists. Within the Tiburon town limits, the rail trail passes through the Richardson Bay Park and next to the Audubon Society's Richardson Bay Sanctuary. These provide excellent opportunities for observing wildlife.