Nautilus is the name of several submarines, submersibles, and semisubs. They are named for the nautilus.
Military subs
- , a French First Republic sub designed by Fulton, considered the first practical sub (1800–1802)
- , a French Navy sub, a (1927–1947)
- , a UK Royal Navy sub, the largest RN sub at service entry (1914–1922)
- , a U.S. Navy sub, a (1930–1945)
- , a prototype U.S. Navy sub, the first nuclear submarine (1954–1980)
Civilian subs
- , a former U.S. Navy submarine, a O-class submarine (1917–1931)
- , a Danish civilian home-built sub, part of a 2017 murder case (2009–2018)
Fictional subs
- , a fictional submarine created by Jules Verne. Found in the novels Twenty Thousand Leagues Under the Seas (1870) and The Mysterious Island (1874)
See also
- List of ships named Nautilus
- Nautilus (disambiguation)