MacNaughton Mountain is a mountain located in Essex County, New York, named after James MacNaughton (1851–1905), the grandson of Archibald McIntyre. The mountain is part of the Street Range of the Adirondack Mountains. The western slopes and north end of MacNaughton Mountain drain into Preston Ponds and Duck Hole pond, the source of the Cold River, which drains into the Raquette River, the Saint Lawrence River in Canada, and into the Gulf of Saint Lawrence. The eastern slopes and south end of MacNaughton Mtn. drain into the southern Indian Pass Brook, thence into Henderson Lake, the source of the Hudson River, and into New York Bay. MacNaughton Mountain is within the High Peaks Wilderness Area of New York's Adirondack Park.