Proteus may refer to:
- Proteus, a Greek god who is the son of Poseidon
- Proteus (film), a film by Canadian director John Greyson
- Proteus (moon), a natural satellite of Neptune
- Proteus (bacterium), a genus of Proteobacteria responsible for many human urinary tract infections
- Proteus (alchemy), the "first matter" (prima materia), usually the metal mercury
- Proteus (instant messenger), a client for Mac OS X
- Proteus (comics), a Marvel Comics mutant
- Proteus (DC comics), a Steve Ditko creation
- King Proteus, a mythical Greek ruler, featured in the story of Bellerophon
- Proteus of Egypt, an Egyptian king in a version of the story of Helen of Troy
- Proteus syndrome, a very rare congenital disorder known mostly for its most famous sufferer Joseph Merrick (the Elephant man)
- USS Proteus (AS-19), a U.S. Navy submarine tender
- Scaled Composites Proteus, an experimental aircraft
- Proteans, a class of subtle body language flirting signals
- Proteus, a cultivar of Clematis introduced in 1876
- The E-MU Proteus, a popular rackmouunt ROMpler synthesizer
- Proteus, the miniaturized submarine that is injected in a human being's bloodstream in the 1966 movie Fantastic Voyage
- Protei-5 Russian diver-rider, a type of diver propulsion vehicle
- There are at least two makes of diver propulsion vehicle called Proteus
- Olm (Proteus anguinus) a genus of small cave-dwelling amphibian
- Proteus (machine), a 'sound and light machine' designed by Synthetic Systems
- Proteus, a character in the play Two Gentlemen of Verona by William Shakespeare
- Proteus, the Prime Minister in The Apple Cart by George Bernard Shaw
Proteus | Proteo (desambiguación) | Protée | Proteus | Proteo | Proteus | Proteus | Proteus | Proteu