Grand-Bourg, also known as Grand-Bourg de Marie-Galante (French pronunciation: [ɡʁɑ̃ buʁ də maʁi ɡalɑ̃t], Antillean Creole: Gwanbou Mawigalant or Granbou Marigalant), is a commune on the island of Marie-Galante, in the French overseas region and department of Guadeloupe, in the Lesser Antilles, Caribbean.

The Marais Folle Anse, a vast fresh water reserve, allowed habitation by native Arawaks at the beginning of the 1st millennium.

The island's best beach lies adjacent to Grand-Bourg: Plage de la Feuillère, a 2 km (11⁄4-mile) stretch of white sand that is favored by swimmers and sunbathers.

According to the legend, it was Jeanne Laballe, a fine arts student and wife of Dominique Murat, who laid out the château at the beginning of the 19th century.

Today, it is an eco-museum of arts and traditions where on several hundred square meters it houses over three centuries of Guadeloupe's sugar refinery history up to the colonial age.

The Roussel-Trianon Plantation, today owned by the Council General of Guadeloupe, is noted for its stables, which are still in very good condition, and for the smoke stack of the old sugar refinery which figures on the list of historical monuments.

The family and rural center that adjoins this sight is creating a museum project, "Alonzo", that during the year 2000 will provide a scenography of the said events.