Sylvan Beach is a community located within Vashon, Washington, in King County, Washington, on the west side of Vashon Island on Colvos Passage. It is known as one of Vashon's walk-in communities, since most of the homes can only be reached by walking in from the road on the community's boardwalk. Supplies and goods are conveyed to the homes using wheelbarrows.

Sylvan Beach is noted on navigational charts probably because of the old pilings which extend 100 yards out into Colvos Passage. The piles are all that remains of a dock that served the Virginia V, the passenger-only, mosquito fleet, steamship ferry, that ran daily from Tacoma to Seattle.

47°29′57″N 122°28′38″W / 47.49917°N 122.47722°W / 47.49917; -122.47722