| Leitsystem | distributed control system |
| Leitsymptom | cardinal symptom |
| Exosystem | exosystem |
| IT-System | IT system |
| Leisten | last |
| leisten | relinquish |
| Leitsatz | axiom |
| Leitstern | lodestar |
| Leinster | Leinster |
| Leiste | band fillet strip batten trim groin |
| Dateisystem | file system |
| Typsystem | type system |
| Wahlsystem | voting system |
| Lymphsystem | lymphatic system |
| Sternsystem | star system |
| Subsystem | subsystem |
| System | system structure |
| Tonsystem | pitch space |
| Zweiersystem | binary numeral system |
| Ökosystem | ecosystem |