| Acronym | Definition |
|---|
| OTU➣Operational Training Unit |
| OTU➣Operational Taxonomic Unit |
| OTU➣Oxygen Toxicity Unit (scuba diving) |
| OTU➣Optical Transport Unit (IEEE) |
| OTU➣One-Time Use (disposable) |
| OTU➣Over to You |
| OTU➣Oxygen Tolerance Unit |
| OTU➣Office of Technology Utilization |
| OTU➣Oceania Taekwondo Union |
| OTU➣Optical Translator Unit (Lucent) |
| OTU➣Overrating the Underrated (music website; UK) |
| OTU➣Once-Through Utility (boiler type) |
| OTU➣Output Terminal Unit |
| OTU➣Operating Time Update |
| OTU➣Outcome Tracking Unit |
| OTU➣Occupational Therapy Unit |
| OTU➣Organizational Taxonomic Unit |
| OTU➣Old Town Underground (Michigan) |