Tiburon (; Spanish: Tiburón, [tiβuˈɾon]) is an incorporated town in Marin County, California. It is located on the Tiburon Peninsula, which reaches south into the San Francisco Bay. The smaller city of Belvedere (formerly a separate island) occupies the southwest 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 mostly surrounded by the Bay. Besides Belvedere and Tiburon, much of the peninsula is unincorporated, including portions of the north side and the communities of Strawberry and Paradise Cay.

The population of Tiburon was 8,962 at the 2010 census. Belvedere and Tiburon share a post office.

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 San Francisco and North Pacific Railroad (subsequently the Northwestern Pacific Railroad), which transported freight 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.