Do, DO or D.O. may refer to:
Languages
- The English verb, do, which may serve as an auxiliary verb; see do-support
- Do (kana), a mora symbol in Japanese writing
- Ditto mark
People
- Đỗ, a Vietnamese surname
- Do (surname), includes people with the surname
- D.O. (entertainer) (born 1993), South Korean singer and actor
- D.O. (rapper), Canadian rapper
- Do (singer) (born 1981), Dutch singer
- Marshall Applewhite (1931–1997), American cult leader
Music
- The Dø, a French/Finnish indie pop band
- Do (Do album), an album by Dutch singer Do
- Do (Psychostick album)
- C (musical note), the first note of the musical scale in fixed do solfège
- Delta Omicron, an international music fraternity
- Do, the first syllable of the scale in solfège
- Do, a type of buk (drum) used in Korean ritual music
- "Do", a song by the White Stripes from the 1999 album The White Stripes (album)
Science and medicine
- The DO, an online magazine published by the American Osteopathic Association
- Dansgaard–Oeschger event, in climate science
- Delta Omega, an American public health honorary society
- Doctor of Osteopathic Medicine
- Dissolved oxygen
Technology
- .do, the country code top level domain for the Dominican Republic
- Dornier Flugzeugwerke, a defunct German aircraft manufacturer
- GNOME Do, an application launcher for Linux
- Dō, the torso protection in a suit of kendo armor
Places
- Do (province), the Korean and Japanese administrative division equivalent to the ancient Chinese dao
- Do (administrative division), an administrative unit in both North and South Korea
- Do (Berkovići), Bosnia and Herzegovina
- Do (Hadžići), Bosnia and Herzegovina
- Do, Stolac, Bosnia and Herzegovina
- Do (Trebinje), Bosnia and Herzegovina
- Dô, former state in modern-day Mali
- Do, Ivory Coast
- Dominican Republic
Other uses
- DO (film)
- Dō (philosophy), a doctrine or lifestyle in Japanese and Korean cultures
- Delivery order
- Denominación de origen, a Spanish wine appellation
- Directorate of Operations (CIA) of the United States Central Intelligence Agency
- Dominicana de Aviación, a defunct Dominican airline
- Do, the number twelve in the duodecimal system
See also
- D/O (disambiguation)
- D0 (disambiguation) (D followed by zero)
- Doe (disambiguation)
- Doo (disambiguation)
- Doh (disambiguation)
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