| open goederenwagon | open freight car |
| open haard | hearth |
| open huis | open house |
| Open inhoud | Open content |
| Open Inventor | Open Inventor |
| Open lijn | Open file |
| Open Monumentendagen | European Heritage Days |
| open plek | open space |
| Open publicatie | Open publishing |
| open rug | spina bifida |
| open ruimte | clear |
| Open Site | Open Site |
| Open Society Institute | Open Society Institute |
| Open Source | Open source |
| Open Source Definition | Open Source Definition |
| Open source software | Open source |
| Open spel | Open Game |
| Open standaard | Open standard |
| Open sterrenhoop | Open cluster |
| open tribune | bleachers |
| open tweepersoonsauto | roadster |
| Open Universiteit | Open University |
| Open University | Open University |
| open veld | country |
| Open verzameling | Open set |
| Open Vlaamse Liberalen en Democraten | Flemish Liberals and Democrats |
| Open your heart | Open Your Heart |
| open zee | open sea |
| open zweer | ulcer |
| open-hart- | open-heart |
| Open-source software | Open source |
| Open-Sourcesoftware | Open source |
| OpenArena | OpenArena |
| openbaar | public |
| openbaar gebouw | public building |
| openbaar maken | release |
| Openbaar Ministerie | public prosecutor |
| Openbaar onderwijs | Public school |
| openbaar vervoer | public transportation |
| openbaarheid | publicity |
| openbaarmaking | publication |
| openbare aanklaagster | prosecutor |
| openbare aanklager | prosecutor |
| Openbare ruimte | Public space |
| openbare schennis der eerbaarheid | indecent exposure |
| openbare sector | public sector |
| openbare voorziening | utility |
| openbare zedenschennis | indecent exposure |
| openbaren | expose |
| openbarend | revealing |
| Openbaring | Apocalypse |
| Openbaring van Johannes | Apocalypse |
| openbarsten | burst open |
| openbloeien | flower |
| openbreken | burst open |
| openbreking | breakdown |
| opendeurdag | open house |
| opendoen | open |
| opendraaien | turn on |
| openen | open |
| opener | tin-opener |
| opengooien | fling open |
| openhalen | lay open |
| openhartchirurgie | open-heart surgery |
| openhartig | plain |
| openhartig zijn tegen | be plain with |
| openhartigheid | candidness |
| openheid | candidness |
| openhouden | reserve |
| opening | gap |
