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.

The Puget Sound Navigation Company (PSNC) was founded by Charles E. Peabody in 1898. Today the company operates an international passenger and vehicle ferry service between Port Angeles, Washington, United States and Victoria, British Columbia, Canada on the MV Coho, through its operating company, Black Ball Ferry Line.