Deinze (Dutch pronunciation: [ˈdɛinzə] ⓘ) 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, Hansbeke, Landegem, Meigem, Merendree, Nevele, Petegem-aan-de-Leie, Poesele [nl], Sint-Martens-Leerne, Vinkt, Vosselare, Wontergem, and Zeveren.

The municipality's total area is 128.03 km2 (49 sq mi), giving a population density of 342 inhabitants per km2.

The DEYNZE post office opened in 1836 with the postal code 31 (before 1864), then 94 prior to 1874.

[2] Postal codes in 1969[3] (before the merger of municipalities in 1977): Deinze is the starting location of the cycling race Gent–Wevelgem.