USS Fortitude may refer to the following ships operated by the United States Navy:
- USS Fortitude (AMc-81), was an Accentor-class coastal minesweeper during World War Two
- HSV Fortitude (JHSV-3), original name for USNS Millinocket (T-EPF-3) before the Navy took over the project
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.