| OAT | O-acetyltransferase 
| Others |
| OAT | Object Alternation Test
| Others |
| OAT | Object Attribute Traces
| Others |
| OAT | Obscene Articles Tribunal
| Others |
| OAT | Observed Arrival Time
| Others |
| OAT | Occluded Artery Trial
| Others |
| OAT | Of All Time
| Others |
| OAT | Off Axis Torque
| Others |
| OAT | Office for the Advancement of Telehealth
| Others |
| OAT | Office of Academic Technology
| Others |
| OAT | Office of Institutional Research
| Others |
| OAT | Ohio Achievement Test
| Others |
| OAT | Oklahoma Antique Tractor Association
| Others |
| OAT | Oldest Active Transaction
| Others |
| OAT | oligoasthenoteratozoospermia
| Others |
| OAT | Open Air Theater
| Others |
| OAT | Open Air Theatre
| Others |
| OAT | Open Artery Trial
| Others |
| OAT | OpenLink AJAX Toolkit
| Others |
| OAT | Operational Acceptance Test
| Others |
| OAT | Operational Acceptance Testing
| Others |
| OAT | Opposite Angle Theorem
| Others |
| OAT | Optimized Ahead of Time
| Others |
| OAT | Optometry Admission Test
| Others |
| OAT | Oral Anticoagulation Therapy
| Others |
| OAT | Oral Appliace Therapy
| Others |
| OAT | Oral Appliance Therapy
| Others |
| OAT | Organic Acid Technology
| Others |
| OAT | Organic Additive Technology
| Others |
| OAT | Organic Anion Transporter
| Others |
| OAT | Original And Timeless
| Others |
| OAT | ornithine acetyltransferase
| Others |
| OAT | ornithine aminotransferase
| Others |
| OAT | osteoarticular tuberculosis
| Others |
| OAT | Out of Area Transfer
| Others |
| OAT | Outdoor Adventure Training
| Others |
| OAT | Outdoor Ambient Temperature
| Others |
| OAT | Outside Air Temperature
| Others |
| OAT | Outside Ambient Temperature
| Others |
| OAT | Overall Test
| Others |
| OAT | Overseas Adventure Travel
| Others |
| OAT | Oxygen Atom Transfer
| Others |