| Acronym | Definition |
|---|
| ONG | Organización No Gubernamental (Spanish: Non-Governmental Organization) |
| ONG | Organisation Non Gouvernementale (French: Non-Governmental Organization) |
| ONG | Organização Não-Governamental (Portuguese: Non-Governmental Organization) |
| ONG | Organizzazione Non Governativa (Italian: Non-Governmental Organization) |
| ONG | Ongeveer (Dutch: approximately) |
| ONG | Organizatiile Neguvernamentale (Romanian: Non-Governmental Organization) |
| ONG | Oklahoma Natural Gas |
| ONG | Ohio National Guard |
| ONG | Operation No Gangs (Texas) |
| ONG | Optical Networking Group |
| ONG | Overnight Guest |
| ONG | Mornington, Queensland, Australia - Mornington Is (Airport Code) |
| ONG | Office Next Generation (Microsoft Office) |
| ONG | Optical Network Gateway |