Grand Manan Island (also simply Grand Manan) is a Canadian island, and the largest of the Fundy Islands in the Bay of Fundy. It is the primary island in the Grand Manan Archipelago, sitting at the boundary between the Bay of Fundy and the Gulf of Maine on the Atlantic coast. Grand Manan is jurisdictionally part of Charlotte County in the province of New Brunswick.

The island lends its name to Grand Manan Parish and the Village of Grand Manan, which has an elected mayor and council; the village includes all of the parish except White Head Island. As of 2016, the village had a population of 2,360.

Grand Manan rests in the midwestern end of the Bay of Fundy, a body of water between the provinces of New Brunswick and Nova Scotia, and home to some of the most extreme tides in the world. It is 32 kilometres south of Blacks Harbour, New Brunswick. The point on the mainland closest to the island is in Washington County, Maine, near the town of Lubec, the easternmost point of the continental United States. Grand Manan is 15 km (9.3 mi) from Maine across the Grand Manan Channel. Grand Manan is 34 km (21 mi) long and has a maximum width of 18 km (11 mi) with an area of 137 square kilometres (53 sq mi).

The vast majority of Grand Manan residents live on the eastern side of the island. Due to limited access, 91-metre (300 ft) cliffs, and high winds, the western side of the island is not residentially developed, although it does feature wind-power ventures and camps at Dark Harbour, a small dulsing community and get-away destination for islanders. Grand Manan has a network of trails for all-terrain vehicles, hiking, mountain biking, nature walks, and presents a challenging landscape for jogging. There are a number of fresh-water ponds, lakes and beaches that are prime locations for sun-bathing, beach combing, and picnics. Other interesting finds on Grand Manan are magnetic sand, and "The Hole-In-The Wall" located in Whale Cove in the village of North Head. Anchorage Provincial Park can be found on the island's southeastern coast between the communities of Grand Harbour and Seal Cove.

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