| Unterhaus | lower chamber lower house House of Commons |
| Unterbau | foundation |
| Unterhalt | alimony upkeep |
| Unterlauf | lower reaches |
| unterhalb | below beneath |
| untertags | day daytime during |
| Mutterhaus | parent company |
| Unterzug | girder |
| untertan | subject |
| Untertan | subject |
| Unterarm | forearm |
| Unterart | subspecies |
| Unterbauch | lower abdomen underbelly |
| Untergang | downfall sinking decline |
| Unterhemd | undershirt |
| Unterholz | undergrowth brushwood |
| Unterhose | underpants pants briefs shorts |
| Unterlage | base pad underlay document paper root-stock |
| Untertasse | saucer |
| Unterzahl | minority |