Achen may refer to:
- Hans von Aachen
- Achen, Moselle, a commune Moselle in France
- Tiroler Achen, a river in Austria
- Achen Lake, a lake in Tyrol, Austria
- Achen Pass, a pass in the Alps between Austria and Germany
- Achen, Malayalam word for Father. Also used for addressing Christian Priests and Presbyters in Malayalam.