DO
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DO may refer to:
- Directorate of Operations (DO) of the National Clandestine Service
- Doctor of Osteopathic Medicine (D.O. or DO), one of two degrees held by physicians in the United States
- Dominican Republic, ISO country code: do
- Dominicana de Aviación, IATA code: DO, the national and international airline of the Dominican Republic from 1944-1995
- Delta Omicron, an international music fraternity
- Denominación de Origen (DO), a Spanish wine appellation
- Diesel oil
- Dissolved Oxygen, a measure of oxygen saturation in a medium
- D/O, a delivery order
- Diffractive Optics, a lens design used on Canon EF lenses to reduce chromatic aberrations and weight
- 1xEV-DO (Evolution-Data Optimized), a wireless radio broadband data standard
- DO, one of the prosigns for Morse code