Deinze is a city and a municipality in the Belgian province of East Flanders. It comprises the city of Deinze, and the towns of Astene, Bachte-Maria-Leerne, Gottem, Grammene, Meigem, Petegem-aan-de-Leie, Sint-Martens-Leerne, Vinkt, Wontergem, Zeveren, Nevele, Hansbeke, Landegem, Merendree, Poesele and Vosselare. On January 1, 2020, Deinze had a population of 43,580. The municipality's total area is 127.43 km², giving a population density of 342 inhabitants per km².
On 1 January 2019, the municipality of Nevele was merged into Deinze.