Fort San Jose is a former Spanish fortification on the island of Guam, now a United States territory.

It is located north of the village of Umatac, on a hill overlooking both Fouha Bay and Umatac Bay, the place were Spanish galleons traveling between Manila in the Spanish Philippines and Acapulco, Mexico stopped for water and supplies.

The fort was built about 1802 under the administration of Vicente Blanco, Governor of the Marianas.

The route which the fort protected fell out of use in 1815 with Mexican independence, and it has been ruins since the 1850s.

This article about a property in Guam on the National Register of Historic Places is a stub.