NNO
| Acronym | Definition |
|---|---|
| NNO | Nevládní Neziskové Organizace (Czech: Non-Governmental Organization) |
| NNO | National Night Out (community crime prevention program) |
| NNO | Nordnordost (German; North-North-East) |
| NNO | Nord-Nord-Ovest (Italian: North-North-West) |
| NNO | Nanophthalmos |
| NNO | New Neighbor Orientation |
| NNO | Nintendo News Online (website) |