U73 may refer to:
- German submarine U-73
- Great rhombidodecahedron
- HMAS Warrego (U73), a sloop of the Royal Australian Navy
- Small nucleolar RNA SNORD73
- Uppland Runic Inscription 73
- U73, a line of the Düsseldorf Stadtbahn
This disambiguation page lists articles associated with the title U73.
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