The term Straw Hat can refer to:
- Monkey D. Luffy: a pirate captain with the epithet Straw Hat Luffy and the main protagonist of the series.
- Straw Hat Pirates: a pirate crew led by Monkey D. Luffy, the protagonists of the series.
- Straw Hat Grand Fleet: a fleet formed by seven organizations who vowed to serve under Luffy's crew.
- Straw Hat: Luffy's signature hat given to him by Shanks from which he gets his epithet.
- Straw Hat's Separation Serial: a cover page mini-series depicting what happened to the other eight Straw Hat Pirates after the crew was separated by Bartholomew Kuma at the Sabaody Archipelago.
- Impostor Straw Hat Pirates: a pirate crew led by Demalo, that attempted to impersonate the real Straw Hat Pirates.