Biddeford Pool is a large tidal pool, located off Saco Bay south of the mouth of the Saco River on the south coast of Maine. It is approximately 6 miles southeast of downtown Biddeford, to which it is connected via State Route 208. The town of Kennebunkport is 3 miles southwest, connected via State Route 9.
Biddeford Pool is the site of Maine's first recorded permanent settlement, then called Winter Harbor (not to be confused with present-day Winter Harbor, Maine). In the winter of 1616-1617, Richard Vines, a physician, resided here as part of the colonization efforts of Sir Ferdinando Gorges, lord proprietor of Maine. An early village developed on the north side. In 1688, Fort Mary was built near the pool's entrance. 
During World War II the Biddeford Pool Military Reservation was established from 1941 to 1945, on what is now the Abenakee Golf Club. It had four circular concrete platforms called "Panama mounts" for 155 mm guns, three of which remain today. From December 1941 to 12 February 1943 it was garrisoned by Battery F of the 240th Coast Artillery of the Maine National Guard; this unit was then relieved by Battery E of the 22nd Coast Artillery, which departed in October 1943; it is unclear what unit was at the site after that time.
The small harbor hosts both vacationers and lobstermen. Its water level fluctuates from a large navigable body during high tide to mostly mudflats during low tide. The only exception is the deep mouth, where a gut is located which is naturally dredged by tidal current. It is locally known as "The Gut." Consequently, this is the area where most boats are moored. Wood Island Light is located about a mile offshore to the northeast. 
Biddeford Pool is bounded by the mainland to the south and west, by Hills Beach to the north, and by East Point to the east. The area is a popular summer destination for visitors from as far south as Florida and as far west as California. The pool is surrounded by tall grass salt marshes that are home to a variety of birds and other wildlife. East Point Sanctuary, maintained by the Maine Audubon Society, is considered to be one of the premier birding spots on the northeast coast. Mile Strech Road, a sandy strip of beach which connects the neighborhood of Biddeford Pool to the mainland, is a notable tombolo.
Points of interest around Biddeford Pool include the Biddeford coastal neighborhoods of Hills Beach, Fortune's Rocks, and Granite Point; and the Kennebunkport coastal area of Goose Rocks.
- Coolidge, Austin J.; John B. Mansfield (1859). A History and Description of New England. Boston, Massachusetts. pp. 54–56.
- Fort Mary, Biddeford Pool, Down East Magazine, Vol. 51, Issue 4, Nov. 2004, p. 76 Archived 2015-11-17 at the Wayback Machine.
- "Station Fletcher's Neck, Maine" (PDF). United States Coast Guard. Retrieved 2015-06-14.
- Article on Biddeford Pool Military Reservation at FortWiki.com
- Gaines, William C., Coast Artillery Organizational History, 1917-1950, Coast Defense Journal, vol. 23, issue 2, p. 15
- Varney, George J. (1886), Gazetteer of the state of Maine. Biddeford, Boston: Russell
- Neal, William; Orrin H. Pilkey; Joseph T. Kelley (2007). Atlantic Coast Beaches: A Guide to Ripples, Dunes, and Other Natural Features of the Seashore. Missoula, MT: Mountain Press Publishing Company. p. 272. ISBN 0-87842-534-9.
- City of Biddeford, Maine
- McArthur Public Library
- Biddeford Pool Webpage
- East Point Sanctuary -- Maine Audubon Society
- Friends of Wood Island Lighthouse
- Biddeford Pool Yacht Club
- Biddeford Historical Society
- Biddeford Pool/Fortune's Rocks -- University of Maine Department of Earth Sciences