- OTB method
- OTB法
- OTCCD
- OTE
- O. Teichmueller
- O. Teichmueller (1913—1943)
- Otello
- OTF
- OTFT
- Othello
- Other 3 Billion satellite constellation
- other abdominal surgical instruments
- other abnormal combustion technology of engine
- other adhesives
- other alloy materials
- other basic surgical instruments
- other burn & plastic surgical instruments
- other carbonization technology
- Other Collected Writings at the Ministry of Rites
- other communication disorders
- other ENT surgical instruments
- other examinations
- other family planning instruments
- other feed additives
- other fixed assets investment