Metroid may refer to:
- The Metroid universe, Samus Aran's universe and science-fiction game franchise.
- Metroid, the first game in the series of the same name.
- Metroid, a member of the eponymous species at the core of the franchise.
- Metroid Prime, the main antagonist of the subseries of the same name.
- Queen Metroid, the progenitor of the Metroid species.
- Metroid, the Ike player who helped develop Project M.