Seymour Mountain is a mountain located in Franklin County, New York, named after Horatio Seymour (1810–1886), Governor of New York (1853–1854, 1863–1864).

Seymour Mountain stands within the watershed of the Raquette River, which drains into the Saint Lawrence River in Canada, and into the Gulf of Saint Lawrence.

The northern slopes of Seymour drain into Ward Brook, thence into Ampersand Lake, Ampersand Brook, Stony Creek, and the Raquette River.

Seymour Mountain is within the High Peaks Wilderness Area of New York's Adirondack Park.

This article about a location in Franklin County, New York is a stub.