Adolphustown is a geographic area located in Greater Napanee, Ontario, Canada, on the Adolphus Reach of the Bay of Quinte in Lake Ontario. Adolphustown is now part of the town of Greater Napanee. The rural character of the Adolphustown region remains largely undisturbed today and the area, with its picturesque lakefront location, remains popular for the cultivation of apples and strawberries.
Adolphustown was founded in 1784 by United Empire Loyalists. The original Loyalist Landing site is now the 74-acre (300,000 m2) U.E.L. Heritage Centre & Park, a museum, public park, and family campground.
The settlement was named for Prince Adolphus, Duke of Cambridge, a son of George III. A number of Quakers settled in this area in 1784 and held their first Monthly Meetings in Canada here.
The Old Hay Bay Church, built by United Empire Loyalist settlers in 1792 and the oldest Methodist building in Canada, was designated a National Historic Site of Canada. It is open during the summer.
The settlement serves as the eastern terminus of the ferry crossing to Glenora, Ontario. The ferry is free for vehicles and pedestrians and links the western and eastern halves of one of the oldest colonial roads in the province, the Loyalist Parkway (Ontario Highway 33), at the point where the parkway is interrupted by the Bay of Quinte. This crossing appears to have been in use at least as early as 1802, when an extension of Asa Danforth Jr.'s pioneering road, from eastern Toronto through what is now Trenton, first reached the Bay of Quinte at Stone Mills (Glenora).