Ronin could refer to:
- Clint Barton, Also known as Hawkeye; a Marvel Comics superhero; assumed the name Ronin for a brief period.
- Alexi Shostakov, Also known as Red Guardian; a Marvel Comics superhero.
- Maya Lopez, Also known as Echo; a Marvel Comics character.
- Marc Spector, Also known as Moon Knight; Alternate version from the Ultimate Marvel universe of Marvel Comics.
- Others
- Red Ronin, A robot character featured in Marvel Comics; foe of Godzilla.
- Ronan the Accuser, A Marvel Comics sci-fi character; Kree warrior.
- Ronon Dex, A character from the Stargate Atlantis TV series.