3-letter words starting with u
- uup — Ulster Unionist Party
- uuu — unununium
- uva — ultraviolet light with a relatively long wavelength, able to penetrate the deep layers of the skin.
- uvb — ultraviolet light with a relatively short wavelength.
- uvf — Ulster Volunteer Force
- uwb — ultrawideband
- uwo — Ukrainian Womens Organization
- uwu — Utility Workers Union
- ux. — wife
- uys — Pieter-Dirk. born 1945, South African comedian and satirist, noted for creating the female character Evita Bezuidenhout
- uzi — a compact 9mm submachine gun of Israeli design.