The Arrondissement of Thuin (French: Arrondissement de Thuin; Dutch: Arrondissement Thuin) is one of the seven administrative arrondissements in the Walloon province of Hainaut, Belgium.

Arrondissement of Thuin Arrondissement de Thuin
Arrondissement
Location of the arrondissement in Hainaut
Coordinates: 50°18′N 4°15′E / 50.3°N 4.25°E / 50.3; 4.25
Country	Belgium
Region	Wallonia
Province	Hainaut
Municipalities	11
Area
• Total	780.08 km2 (301.19 sq mi)
Population  (1 January 2017)
• Total	151,699
• Density	190/km2 (500/sq mi)
Time zone	UTC+1 (CET)
• Summer (DST)	UTC+2 (CEST)

The Administrative Arrondissement of Thuin consists of the following municipalities:^[1]

Since 2019

Before 2019

The municipalities of Binche, Estinnes and Morlanwelz are detached from the Arrondissement on January 1, 2019 to create the new Arrondissement of La Louvière.