Oswegatchie is a town in St. Lawrence County, New York, United States.

After the end of the French and Indian War, the British renamed the former French community of La Gallette as Oswegatchie, the name of the local native tribe.

After the end of the American Revolution, the community became Ogdensburg, named for Samuel Ogden, who was a member of a group of land speculators and developers who purchased a large tract of land in the region.

The northwestern town line is defined by the St. Lawrence River, and is an international border with Canada.

New York State Route 37 is a highway on the south bank of the St. Lawrence River.

New York State Route 68 is by the northeastern town line.

20.8% of all households were made up of individuals, and 9.5% had someone living alone who was 65 years of age or older.