OT
- Aeropelican
- Carabao (band)
- O-T Fagbenle
- O-T map
- OT (band)
- Oakville Trafalgar High School
- Oakville Transit
- Oblivious transfer
- Obsession Telescopes
- Occupational therapist
- Occupational therapy
- Off topic
- Offensive tackle
- Old Testament
- Operación Triunfo (Spanish TV series)
- Operating Thetan
- Operation Transformation (TV series)
- Operational technology
- Operational transformation
- Optimality theory
- Organisation Todt
- Oswald Tschirtner
- Ot (Cyrillic)
- Ot Ene
- Ot Pi
- Ot de Montcada
- Ot el bruixot
- Ot en Sien
- Ot of Urgell
- Otmoor
- Ott (disambiguation)
- Overtime
- Overtime (sports)
- Oxygenated treatment
- Oxytocin
- Oyu Tolgoi
- Star Wars original trilogy
- The OT