U64 may refer to:
- German submarine U-64, various vessels
- Great snub dodecicosidodecahedron
- HMS Nereide (U64), a sloop of the Royal Navy
- Monticello Airport (Utah)
- Small nucleolar RNA SNORA64/SNORA10 family
- uint64_t, a 64-bit unsigned integer
This disambiguation page lists articles associated with the title U64.
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