Westdiep was a Wielingen-class frigate of the Belgian Navy. She was launched on 8 December 1975 at the Cockerill Yards in Hoboken, and christened by Princess Astrid of Belgium, on 20 January 1978. The patronage of the Westdiep was accepted by the city of Sint-Niklaas. Westdiep was the second ship in the Wielingen class. She had the pennant number F911. On 5 October 2007 Westdiep, by then the last commissioned frigate of Belgian construction in the Belgian Navy, was withdrawn from service.