| O/ET | Orbiter/External Tank
| Others |
| OET | Occupation English Test
| Others |
| OET | Occupational English Test
| Others |
| OET | Ocean Exploration Trust
| Others |
| OET | Office of Educational Technology
| Others |
| OET | Office of Emergency Transportation
| Others |
| OET | Office of Emergency Transportation (DOT)
| Others |
| OET | Office of Employment and Training
| Others |
| OET | Office of Engineering and Technology
| Others |
| OET | Office of Enterprise Technology
| Others |
| OET | Omni E-Type
| Others |
| OET | Online Education and Training
| Others |
| OET | Oos East Transvaal
| Others |
| OET | Opel Euro Team
| Others |
| OET | Operations Engineering and Technician
| Others |
| OET | Opinion Editor Time
| Others |
| OET | Oregon Equestrian Trails
| Others |
| OET | Organic Electronic Technologies
| Others |
| OET | Other Excluded Transactions
| Others |
| OET | Oxford Expression Technologies
| Others |