Giessenburg is a town in the Dutch province of South Holland. It is a part of the municipality of Molenlanden, and lies about 6 km west of Gorinchem. Giessenburg was a separate municipality between 1957 and 1986. It was created in a merger of the municipalities Giessen-Nieuwkerk and Peursum. In 2010, the town of Giessenburg had 4889 inhabitants. The built-up area of the town was 0.43 km², and contained 911 residences.