| open sea | offene Meer |
| open sea fishing | Hochseefischerei |
| open sea laying | Hochseeverlegung |
| open season | Jagdzeit |
| open season for | Jagdsaison |
| open season for game | Jagdsaison |
| open secret | offenes Geheimnis |
| Open Secrets | Offene Geheimnisse |
| open sentence | Aussageform |
| Open set | Offene Menge |
| open shop | nicht gewerkschaftspflichtiger Betrieb |
| open shop operation | Open-shop-Betrieb |
| open shortest path first | OSPF-Protokoll |
| open sight | offene Visierung |
| Open skies | Open Skies |
| Open Society Institute | Open Society Institute |
| open sore | offene Wunde |
| Open Sound System | Open Sound System |
| Open source | Open Source |
| Open Source Definition | Open Source Definition |
| Open Source Development Labs | Open Source Development Labs |
| Open source hardware | Freie Hardware |
| Open Source Intelligence | Open Source Intelligence |
| Open source movement | Open-Source-Bewegung |
| Open source software | Open Source |
| open source software , OSS | Open-Source-Software |
| open space | freier Raum |
| open space design | Freiraumplanung |
| open space planning | Freiraumplanung |
| Open Space Technology | Open Space |
| open spaces | unbebaute Flächen |
| open squared bracket - close squared bracket | eckige Klammer auf - eckige Klammer zu |
| open stack | Freihandmagazin |
| open stacks | offene Magazine |
| open stand | lückiger Bestand |
| Open standard | Offener Standard |
| Open star cluste | Offener Sternhaufen |
| Open star cluster | Offener Sternhaufen |
| Open star clusters | Offener Sternhaufen |
| open start pulse | Anlaufschritt |
| open statement | Eröffnungsanweisung |
| open sth. by blasting | etw. aufschießen |
| open sth. to traffic | etw. für den Verkehr freigeben |
| open string | Leersaite |
| open string stairs | aufgesattelte Treppe |
| open strings | Leersaiten |
| open strip | Schneise |
| open subroutine | offenes Unterprogramm |
| open surgery | offene Chirurgie |
| open surgical drainage , OSD | offene chirurgische Drainage |
| open system | offenes Kommunikationssystem |
| open system interconnectio | offenes Kommunikationssystem |
| open system interconnection | Kommunikation offener Systeme |
| Open systems interconnect | Open Systems Interconnection |
| open systems interconnection | Offene Kommunikation |
