| Acronym | Definition |
|---|
| OMT | One More Time |
| OMT | Organización Mundial del Turismo (Spanish: World Tourism Organization; UN) |
| OMT | Oscillating Multi-Tool |
| OMT | One More Thing |
| OMT | Organisation Mondiale du Tourisme |
| OMT | Online Money Transfer |
| OMT | Opioid Maintenance Treatment |
| OMT | Outright Monetary Transaction (European Central Bank) |
| OMT | Osteopathic Manual Therapy (healthcare) |
| OMT | Object Oriented Methodology |
| OMT | Output Mapping Table |
| OMT | Object Modeling Technique |
| OMT | Orthogonal Mode Transducer (US DoD) |
| OMT | Object Model Template |
| OMT | Orthomode Transducer |
| OMT | Organization and Management Theory |
| OMT | Osteopathic Manipulative Therapy |
| OMT | Organizzazione Mondiale del Turismo (Italian: World Tourism Organization) |
| OMT | Organización Mexicana de Traductores (Mexican Organization Translators) |
| OMT | Order Management Tool (software) |
| OMT | Operational Management Team |
| OMT | Ophthalmic Medical Technology |
| OMT | Obermaat (German military) |
| OMT | Oh My Tebow (football) |
| OMT | Old Merchant Taylors' Society (UK) |
| OMT | Object-oriented Modelling Technique |
| OMT | Overhead Message Train |
| OMT | Object Modelling Tool |
| OMT | Oh My Twilight |
| OMT | Organophilic Montmorillonite (polymer science) |
| OMT | Orientations à Moyen Terme (French: Medium-Term Guidelines; occupational hazards) |
| OMT | Onboard Maintenance Training (Navy) |
| OMT | Operational Maintenance Test |
| OMT | Ocean Measurement Techniques |
| OMT | Our Mothers Tried (band) |
| OMT | Organizational Maintenance Test |
| OMT | Organizational Maintenance Technician |
| OMT | Orthogonal Modeling Technique |
| OMT | Ordo Militaris Templi (gaming) |
| OMT | Operation, Maintenance and Tolling |