Do, DO or D.O. may refer to:
Donald John Trump (born June 14, 1946) is the 45th and current president of the United States. Before entering politics, he was a businessman and television personality.
The domestic dog (Canis lupus familiaris when considered a subspecies of the wolf or Canis familiaris when considered a distinct species) is a member of the genus Canis (canines), which forms part of the wolf-like canids, and is the most widely abundant terrestrial carnivore.
Doctor Who is a British science fiction television programme produced by the BBC since 1963. The programme depicts the adventures of a Time Lord called "the Doctor", an extraterrestrial being, to all appearances human, from the planet Gallifrey.
The Dominican Republic ( də-MIN-ik-ən; Spanish: República Dominicana, pronounced [reˈpuβlika ðominiˈkana] (listen)) is a country located on the island of Hispaniola in the Greater Antilles archipelago of the Caribbean region.
A Doctor of Philosophy (PhD, Ph.D., or DPhil; Latin philosophiae doctor or doctor philosophiae) is the highest university degree that is conferred after a course of study by universities in most countries.
The Dow Jones Industrial Average (DJIA), or simply the Dow (), is a stock market index that indicates the value of 30 large, publicly owned companies based in the United States, and how they have traded in the stock market during various periods of time.
The Ingenious Gentleman Don Quixote of La Mancha (Modern Spanish: El ingenioso hidalgo Don Quijote de la Mancha, pronounced [el iŋxeˈnjoso iˈðalɣo ðoŋ kiˈxote ðe la ˈmantʃa]), or just Don Quixote (, US: , Spanish: [doŋ kiˈxote] (listen)), is a Spanish novel by Miguel de Cervantes.
The Domain Name System (DNS) is a hierarchical and decentralized naming system for computers, services, or other resources connected to the Internet or a private network.
Dopamine (DA, a contraction of 3,4-dihydroxyphenethylamine) is an organic chemical of the catecholamine and phenethylamine families.