The Anacortes–San Juan Islands ferry is a system of ferry route operated by Washington State Ferries. The routes serve Anacortes, Lopez Island, Shaw Island, Orcas Island, San Juan Island, and Sidney on Vancouver Island in Canada. The ferry routes are part of State Route 20 Spur.

Washington State Ferries (WSF) is a government agency that operates automobile and passenger ferry service in the U.S. state of Washington as part of the Washington State Department of Transportation. It runs ten routes serving 20 terminals located around Puget Sound and in the San Juan Islands, designated as part of the state highway system. The agency maintains a fleet of 21 vessels that are able to carry passengers and vehicles.