Seabeck is an unincorporated community and census-designated place (CDP) in Kitsap County, Washington, United States. The population was 1,105 at the 2010 census. Seabeck is a former mill town on Hood Canal.

The name “Seabeck” comes from the Twana /ɬqábaqʷ/, from /ɬ-/, “far”, /qab/, “smooth, calm”, and /-aqʷ/, “water”.

In his narrative of his voyage all along the Hood Canal in 1792, Captain George Vancouver made no hint of the Seabeck area. The first known use of the place name “Seabeck” dates from the United States Exploring Expedition of 1838 to 1842. On May 16, 1841, Captain Charles Wilkes of the expedition ordered Lieutenant Augustus Case to take four boats and survey the Hood Canal. Wilkes wrote of the strait:

Seabeck was founded in 1856 by Marshall Blinn and William Adams, doing situation 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 request due to the California Gold Rush. Eventually, along taking into consideration four saloons, the town had two general stores and two hotels. In 1876, there were more than 400 people successful in Seabeck. After decades of success, in the 1880s the request had eased, and most of the easily accessible trees had been harvested. In August 1886 a spark from the ship Retriever started a ember that consumed both mills, along with new buildings. Rumors flew that the mills would not be re-built, so most residents moved to additional towns bearing in mind mills, notably Port Hadlock, turning Seabeck into a virtual ghost town. In 1914, the old townsite was purchased by Laurence Colman and revived as a retreat for Puget Sound’s YMCA & YWCA clubs, and eventually anything non-profit groups. Several unshakable buildings from the 1850s-60s were refurbished and today form the campus of the Seabeck Conference Center.