The San Francisco Maritime National Historical Park is located in San Francisco, California, United States. The park includes a fleet of historic vessels, a visitor center, a maritime museum, and a library/research facility. Formerly referred to as the San Francisco Maritime Museum, the collections were acquired by the National Park Service in 1978. The San Francisco Maritime National Historical Park was authorized in 1988; the maritime museum is among the park's many cultural resources. The park also incorporates the Aquatic Park Historic District, bounded by Van Ness Avenue, Polk Street, and Hyde Street.

Alma de Bretteville Spreckels' last major project was the construction of the San Francisco Maritime Museum. When it opened in 1951, her collection of model ships that had been on display at the 1939–40 Golden Gate International Exposition was the main exhibit. She had had a feud with museum founding director, Karl Kortum, and as a result, did not receive much recognition for her role in the museum's establishment.

The historic fleet of the San Francisco Maritime National Historical Park is moored at the park's Hyde Street Pier. The fleet consists of the following major vessels:

• Balclutha, an 1886 built square rigged sailing ship.
• C.A. Thayer, an 1895 built schooner.
• Eureka, an 1890 built steam ferryboat.
• Alma, an 1891 built scow schooner.
• Hercules, a 1907 built steam tug.
• Eppleton Hall, a 1914 built paddlewheel tug.

• 
  Scow schooner Alma
• 
  Steam tug Hercules
• 
  Square rig sailing ship Balclutha
• 
  Paddlewheel tug Eppleton Hall
• 
  Steam ferryboat Eureka
• 
  Lumber schooner C.A. Thayer

The fleet also includes over one hundred small craft.

The visitor center is housed in the park's 1909 waterfront warehouse, located at the corner of Hyde and Jefferson streets. The City of San Francisco declared the four-story brick structure a historic landmark in 1974, and the building was listed on the National Register of Historic Places in 1975. Inside, exhibits (including a first order Fresnel lighthouse lens and a shipwrecked boat) tell the story of San Francisco's colorful and diverse maritime heritage. The visitor center also contains a theater and an information desk.

The maritime museum used to be housed in a Streamline Moderne (late Art Deco) building that is the centerpiece of the Aquatic Park Historic District, a National Historic Landmark at the foot of Polk Street and a minute's walk from the visitor center and Hyde Street Pier. The building was originally built (starting in 1936) by the WPA as a public bathhouse, and its interior is decorated with fantastic and colorful murals, created primarily by artist and color theoretician Hilaire Hiler. The architects were William Mooser Jr. and William Mooser III.

The Maritime Research Center is the premier resource for San Francisco and Pacific Coast maritime history. Originating in 1939, the collections have become the largest maritime collection on the west coast and the largest museum and research collection in the National Park Service.

The collections include more than:

• 35,000 published titles comprising over 74,000 items
• 500,000 photographs
• 7,000 archival and manuscript collections
• 150,000 naval architecture and marine engineering drawings
• 3,000 maps and charts
• 150,000 feet of motion picture film and video
• 6,000 historical archaeology artifacts
• 2,500 pieces of folk and fine art
• 40,000 history objects
• 100 small craft
• 50,000 pieces of ephemera
• 600 oral histories and audio recordings

The San Francisco Maritime National Park Association is the primary nonprofit partner to the Park.

The visitor center, Hyde Street Pier, and Maritime Museum are all situated adjacent to the foot of Hyde Street and at the western end of the Fisherman's Wharf district. The park headquarters and Maritime Research Center are located in Fort Mason, some 10 minutes walk to the west of the other sites. The Beach and Hyde Street terminal of the San Francisco cable car system adjoins the main site, while the Jones Street terminal of the F Market historic streetcar line is some 5 minutes walk to the east.

Aquatic Park is a popular place for open water swimming, both for recreation and training. The South End Rowing Club and Dolphin Club are located in Aquatic Park. There have been several incidents of swimmers being bitten by sea lions.

• 49-Mile Scenic Drive
• List of maritime museums in the United States
• List of museum ships

Bill Pickelhaupt, "San Francisco's Aquatic Park," Charleston, SC, 2005, ISBN 0-7385-3084-0

• Official website
• NPS: Aquatic Park Historic District