The Horn (or Saddleback Horn) is a mountain located in Franklin County, Maine. The Horn is flanked to the southwest by the main summit of Saddleback Mountain, to the northeast by Saddleback Junior, and to the northwest by Potato Nubble.
The Horn drains to the northeast into Redington Stream, thence into the South Branch of the Dead River, the Kennebec River, and into the Gulf of Maine. The Horn drains to the west into Saddleback Lake, thence into Redington Stream. The Horn drains to the south into Winship Stream, thence into Conant Stream, Orbeton Stream, and the Sandy River, another tributary of the Kennebec. The Horn drains to the southeast into Hardy Stream, thence into Orbeton Stream.