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Duin stands for:
- Dvin , medieval city in Armenia
- Duin , Rhaeto-Romanic name of the municipality of Duvin in the canton of Graubünden, Switzerland
People:
- Albert Duin (* 1953), German politician (FDP)
- André van Duin (* 1947), Dutch comedian, actor and singer
- Garrelt Duin (* 1968), German politician (SPD)
- Joey Duin (* 1981), Dutch handball player
- Maarten van der Duin (* 1967), Dutch screenwriter, film director and playwright
- Marco van Duin (* 1987), Dutch football player
- Rianne van Duin (* 1994), Dutch table tennis player
