| Type: | Arrondissement |
| Coordinates: | 50.36°N 3.24°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Belgium |
| Subdivision Type1: | Region |
| Subdivision Type2: | Province |
| Parts Type: | Municipalities |
| Parts Style: | para |
| P1: | 12 |
| Unit Pref: | Metric |
| Area Total Km2: | 708.70 |
| Population Footnotes: | [1] |
| Population Total: | 223553 |
| Population As Of: | January 1, 2020 |
| Population Density Km2: | auto |
| Timezone1: | CET |
| Utc Offset1: | +1 |
The Arrondissement of Tournai-Mouscron (;) is one of the seven administrative arrondissements in the Walloon province of Hainaut, Belgium. The Arrondissement of Tournai-Mouscron was created in 2019 by the merger of the former arrondissements of Tournai and Mouscron.
The Administrative Arrondissement of Mouscron consists of the following municipalities (with their Dutch name):