Shilshole Bay Marina is a 1400-slip^[1] saltwater marina in the Ballard neighborhood of Seattle, Washington, operated by the Port of Seattle. The marina is protected by a 4,000-foot (1,200 m) breakwater,^[1] features a roughly 1-mile (1.6 km) public promenade with view of the Olympic Mountains, and includes Leif Erikson Plaza, site of a 16-foot (4.9 m)^[2] statue of the Viking Leif Erikson.

The marina was completed in 1958^[2] and underwent a US$80 million modernization beginning in 2004, including a completely replaced marina building.^[1] There is 2,700 linear feet (820 linear metres) of guest moorage.^[1] Boats at the marina range from kayaks to megayachts, with the largest moorage spaces accommodating yachts up to 250 feet (76 m).^[1]

The marina accommodates both long-term and short-term moorage. Services include an independently operated fuel dock, an independently operated boatyard, a Small Boat & Sailing Center with three hoists and kayak launch, a limited amount of dry moorage, restrooms, showers, laundry, self-service sewer and bilge pump-out, and free garbage disposal, recycling, and oil and HAZMAT collection. Parking is free, and Comcast Cable TV and high-speed Internet connection are included in dock fees.^[1] The City of Seattle Department of Parks and Recreation operates a boat ramp at the north end of the marina, allowing boats to be loaded and unloaded from trailers.^[1]