Patos Island Lighthouse
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| Location: | San Juan Islands, Washington |
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| Coordinates WGS-84 (GPS) |
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| Foundation: | Surface |
| Construction: | Wood |
| Year first lit: | 1908 |
| Automated: | 1974 |
| Tower shape: | Square |
| Height: | ft |
| Original lens: | Fourth order Fresnel lens |
Patos Island Lighthouse is a lighthouse at Alden Point on the western tip of the San Juan Islands off the coast of Washington state in the north-west of the United States.
The original light station was a post light and third class Daboll trumpet fog signal. Beginning operation on November 30, 1893, the light was used as a navigational aid to steamships traveling from Nanaimo, British Columbia to Alaska.
The lighthouse was improved in 1908 with a new fog signal and a 38-foot tower, which housed a fourth-order Fresnel lens. The light was automated in 1974. Today, it flashes a white light once every six seconds. The fourth-order Fresnel lens, which was also used at Alki Point Lighthouse, is on display at Admiralty Head Lighthouse in Washington.
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