Two vessels of the United States Navy have been named USS Katahdin, after Mount Katahdin.
- USS Katahdin (1861), was a screw gunboat commissioned in early 1862, active throughout the American Civil War, and decommissioned shortly after war's end
- USS Katahdin (1893), was an ironclad ram in service from 1897 to 1909
This article includes a list of ships with the same or similar names. If an internal link for a specific ship led you here, you may wish to change the link to point directly to the intended ship article, if one exists.