U 80
U 80 may refer to:
- SM U 80, U- boat of the German Imperial Navy in World War I
- U 80 ( Kriegsmarine ), a submarine of the German Wehrmacht in World War II
- Which is currently in planning line U80 in the network of Düsseldorf Stadtbahn; see list of Düsseldorf Stadtbahn lines
- Disambiguation
- Abbreviation