Fort Dufferin is a former Canadian government post near the Canada–United States border at Emerson, Manitoba.

The fort was used during the 1870s as a base for the North American Boundary Commission and the North-West Mounted Police (NWMP), and as an immigration station.

Fort Dufferin was constructed in 1872 on a site along the west bank of the Red River three kilometres north of the present-day border station at Emerson.

Named for Governor General Lord Dufferin, it was originally used as a base for the Canadian-British contingent of the North American Boundary Commission, which was tasked with surveying the international border along the 49th parallel north, as agreed upon by the British and American governments in the Treaty of 1818.

On July 8, 1874, the NWMP moved out and began their journey west to bring law and order to the North-West Territories.