| Custom House | |
| Native Name: | Ancienne-Douane |
| Native Name Lang: | fr |
| Architectural Style: | Palladian revival |
| Coordinates: | 45.5026°N -73.5542°W |
| Start Date: | 1836 |
| Completion Date: | 1838 |
| Renovation Date: | 1881-1882 |
The Old Custom House (French: links=no|Ancienne-Douane) is a building in what is now Old Montreal, which served as Montreal's first custom house. The building was completed in 1836, designed by Montreal architect John Ostell in the Palladian revival style. It is a National Historic Site of Canada. It now houses the Pointe-à-Callière Museum's gift shop.[1]