Quoin or Du Quoin may refer to:
- Places
- Quoin Bluff, Western Australia
- Quoin Hill Airport, Vanuatu
- Du Quoin, Illinois, USA
- Du Quoin (Amtrak station)
- Du Quoin State Fairgrounds
- DuQuoin State Fairgrounds Racetrack
- Other
- Quoin (architecture), architectural decoration
- Quoin (gunnery), a wedge used in aiming a cannon
- See also
- Quoin Island (disambiguation)