| Arrondissement of Sint-Niklaas | |
| Type: | Arrondissement |
| Coordinates: | 51.2°N 4.15°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Belgium |
| Subdivision Type1: | Region |
| Subdivision Type2: | Province |
| Parts Type: | Municipalities |
| Parts Style: | para |
| P1: | 7 |
| Unit Pref: | Metric |
| Area Total Km2: | 474.60 |
| Population Density Km2: | auto |
| Timezone1: | CET |
| Utc Offset1: | +1 |
| Timezone1 Dst: | CEST |
| Utc Offset1 Dst: | +2 |
The Arrondissement of Sint-Niklaas (;) is one of the six administrative arrondissements in the Province of East Flanders, Belgium.
The Administrative Arrondissement of Sint-Niklaas consists of the following municipalities: