Katahdin is a mountain in Piscataquis County, Maine, US.
Katahdin may also refer to:
- Katahdin Falls, tallest waterfall in Maine
- Arctic Katahdin Butterfly
- Katahdin sheep, a breed of domestic sheep developed in Maine
- Katahdin Iron Works, a Maine state historic site
- Katadhin (steamboat), a steamboat on Moosehead Lake
- USS Katahdin, two United States Navy vessels
See also
- Katahdin Woods and Waters National Monument, a National Monument adjacent to Mount Katahdin