The Semiahmoo Harbor Lighthouse was a lighthouse on Semiahmoo (/ˌsɛmiˈɑːmoʊ/ SEM-ee-AH-moh) Bay near the port of Blaine, Whatcom County, Washington, in the United States.

[1] The station consisted of a 1½-story dwelling built on a platform supported by wooden piles, with a lantern at the center of its peaked roof.

[1] It was constructed in 1905, using the same design by U.S. Lighthouse Board Architect Carl Leick used at the Desdemona Sands Lighthouse at the mouth of the Columbia River.

[2][3] The light was deactivated and the entire structure torn down in 1944.

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