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. On 1 January 2022, Deinze had a population of 44,315. The municipality's total area is 128.03 km (49 sq mi), giving a population density of 342 inhabitants per km.

On 1 January 2019, the municipality of Nevele was merged into Deinze.

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In 1695, during the Nine Years' War, an English force garrisoned in the town under the command of the Irish general Francis Fergus O’Farrell was forced to surrender to French forces.

The DEYNZE post office opened in 1836 with the postal code 31 (before 1864), then 94 prior to 1874. The only other office in the area before 1910 was PETEGHEM (not to be confused with PETEGHEM-LEZ-AUDENAERDE), which opened 1 June 1874.

Postal codes in 1969 (before the merger of municipalities in 1977):

Deinze is the starting location of the cycling race Gent–Wevelgem. It is also the operational base of the Ineos Grenadiers cycle racing team, formally Team Sky.

• Museum van Deinze en de Leiestreek, a museum dedicated to arts and folk objects created in the Leie region
• Ooidonk Castle, a castle dating from the 16th century
• Filliers Grain Distillery, a gin distillery

• Dirk van Braeckel, head of design at Bentley Motors
• Karel Justinus Calewaert, Roman Catholic bishop
• Raoul De Keyser, painter
• Rudy Dhaenens, cyclist, World Champion in 1990
• Poppo of Deinze, saint
• Jacques Rogge, president of the International Olympic Committee
• Charles Felix Van Quickenborne, founder of Saint Louis University in St. Louis, Mo., USA
• Karel Van Wijnendaele, founder of the Tour of Flanders
• Tanneke Sconyncx, alleged witch
• Rose Bertram, fashion model

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  Deinze on the Ferraris map (around 1775)
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  Deinze, church: parochiekerk Sint-Martinus en Sint-Antonius Abt
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  Bachte Maria Leerne, de Blauwe Poort (entrance gate to castle: kasteel van Ooidonk)
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  Bachte Maria Leerne, church: de parochiekerk Sint Petrus en Paulus

• Deinzeonline.be - Available in Dutch
• Official website - Available in Dutch, French, German and English
• Local radio station website (in Dutch)