Mare Island Lighthouse was a lighthouse in California, United States, on the north shore of San Pablo Bay at the entrance to Carquinez Strait, California.

[1] The lighthouse was designed by Paul J. Pelz, who also designed Mare Island's sister stations, Point Fermin Light in San Pedro CA, East Brother Island Light in Richmond, California, Point Hueneme Light in California (replaced in 1940), Hereford Inlet Light in North Wildwood, New Jersey, and Point Adams Light in Washington State (burned down by the Lighthouse Service in 1912), all in essentially the same style.

[2] The United States Lighthouse Board later realized that a light positioned offshore near the junction of the strait and river would better serve navigation in the area.

The station was closed in 1945 after World War II ended and a Navy Radio Beacon was installed.

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