Oostduinkerke (West Flemish: Ôostduunkerke) is a place in the Belgian province of West Flanders, where it is located on the southern west coast of Belgium, so that part of it is a seaside resort. Once a municipality of its own, Oostduinkerke now is a sub-municipality in the municipality of Koksijde. The name "Oostduinkerke" translates as 'East Dunkirk'. The town originally shared its name with the French city of Dunkirk; therefore, in the 13th century, 'Oost-' was added to its name to avoid confusion with its French counterpart.