Seabeck is a former mill town in Kitsap County, Washington, United States, on the Hood Canal.
Seabeck was founded in 1857 by Marshall Blinn and William Adams, doing business as The Washington Mill Company. Their lumber was in such demand they built a second mill, then a shipyard to build boats to haul the lumber to California, which had high demand due to the California Gold Rush. Eventually, along with four saloons, the town had two general stores and two hotels. In 1876, there were over 400 people living in Seabeck.