Do

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
 * 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