Arjen may refer to:
- Arjen Anthony Lucassen (born 1960), composer and musician from the Netherlands
- Arjen Lenstra (born 1956), Dutch mathematician
- Arjen Robben (born 1984), Dutch footballer who plays for Bayern Munich
- Arjen Roelofs (1754–1828), Dutch astronomer
- Arjen Teeuwissen (born 1971), equestrian from The Netherlands
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