DO

DO may refer to:

Directorate of Operations, former name of the National Clandestine Service
Doctor of Osteopathic Medicine, a degree held by physicians in the United States
Dominican Republic, ISO country code: do
- .do, the country code top level domain (ccTLD) for Dominican Republic
IATA airline code for Dominicana de Aviación, an airline of the Dominican Republic in 1944–1995
IATA airline code for Air Vallée
Delta Omicron, an international music fraternity
Denominación de Origen, a Spanish wine appellation
Diesel oil or diesel fuel
Dissolved oxygen or oxygen saturation, a measure of oxygen dissolved in a medium
D/O, or delivery order, a legal document
Diffractive optics, a type of lens on the Canon EF lens mount
Evolution-Data Optimized, a wireless radio broadband data standard
DO, one of the prosigns for Morse code
Discouraged Ones, a 1998 album by Katatonia
Do., an abbreviation for Ditto mark
Daansgard-Oeschger cycles, a solar forcing-based climatic temperature cycle

See also