U45 may refer to:
- Aeroflot Flight U-45
- German submarine U-45, various vessels
- HMS Wild Goose (U45), a sloop of the Royal Navy
- Icositruncated dodecadodecahedron
- Small nucleolar RNA SNORD45
- U45, a line of the Dortmund Stadtbahn
This disambiguation page lists articles associated with the title U45.
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