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- unnotched
- unnotched specimen
- unnumbered
- unnumbered asteroid
- unnumbered frame
- unobservable
- unobservable parameter
- unobservable quantity
- unobservable subspace
- unobstructed deformation
- unobstructed moduli space
- unobtrusive research
- unoccupied
- unoccupied band
- unoccupied level
- UNOCT
- UNODC
- Unofficial Biography of Li Shishi
- Unofficial Biography of Spring and Autumn Annals
- Unofficial History in East
- Unofficial History of Fanghu
- Unofficial History of Qing Dynasty
- Unofficial History of the Last Yuan Emperor
- unofficial literacy books
- unofficial notice