The Weymouth and Portland National Sailing Academy is a centre for the sport of sailing on the Isle of Portland, Dorset, on the south coast of England. The academy building is located in Osprey Quay on the northern tip of the island, and the waters of Portland Harbour and Weymouth Bay, adjacent to the site, are the main areas used for sailing. Local, national and international sailing events have been held at the site since it was opened in 2000, and in 2005 WPNSA was selected to host the sailing events at the 2012 Olympic and Paralympic Games.

The Isle of Portland is a tied island, 6 kilometres (4 mi) long by 2.7 kilometres (1.7 mi) wide, in the English Channel. The southern tip, Portland Bill, lies 8 kilometres (5 mi) south of the resort of Weymouth, forming the southernmost point of the county of Dorset, England. A barrier beach called Chesil Beach joins Portland with mainland England. The A354 road passes down the Portland end of the beach and then over the Fleet Lagoon by bridge to the mainland. The population of Portland is 13,417.