| Unterroutine | subroutine |
| Unterbühne | mezzanine |
| Startroutine | bootstrap |
| Untergattung | subgenus |
| Untersektion | subsection |
| Unterstand | cabana refuge |
| Unterstützer | contributor |
| Untertanin | subject |
| Unterton | subharmonic |
| Unterzeile | subheadline |
| unterjochen | subjugate subdue |
| unterlaufen | eviscerate |
| unterstützend | auxiliary |
| unterstützt | supported |
| untertan | subject |
| Untertan | subject |
| unterworfen | liable |
| Unterboden | subsoil |
| Untergebene | subordinate servant |
| Untergrund | bedrock (geol.) subfloor subgrade (constr., tech., geol.) subsoil substrate substratum base basis footing ground base coat (paint etc.) base material surface undercoat (paint etc.) underground |