U64

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