| Acronym | Definition |
|---|
| TNO➣Texas & New Orleans (railroad; Texas and Louisiana) |
| TNO➣Nederlands Instituut voor Toegepaste Geowetenschappen |
| TNO➣Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek |
| TNO➣Théâtre du Nouvel Ontario (Canadian theater) |
| TNO➣Trans-Neptunian Object |
| TNO➣The New Order (paramilitary street gang) |
| TNO➣Tamarindo, Costa Rica (Airport code) |
| TNO➣The Network Observer (monthly online newsletter; 1994-1996) |
| TNO➣The Neopian Orphanage (guild) |
| TNO➣Trust No One |
| TNO➣Thursday Night Out (party group in the Seattle, WA area) |
| TNO➣Thorncliffe Neighbourhood Office (Toronto, Canada) |
| TNO➣Theater Nuclear Option |
| TNO➣Texas and New Orleans Railway (circa 1920) |
| TNO➣Target Natural Orbital |
| TNO➣Texas, New Mexico, and Oklahoma Coaches, Inc. |
| TNO➣Temiscaming and Northern Ontario Railway (old name for Ontario Northland Railway; pre-1945) |