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 Dow Jones Industrial Average (DJIA), or simply the Dow (), is a stock market index that measures the stock performance of 30 large companies listed on stock exchanges in the United States.
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.
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 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.
Dolly Rebecca Parton (born January 19, 1946) is an American singer, songwriter, multi-instrumentalist, record producer, actress, author, businesswoman, and humanitarian, known primarily for her work in country music.
Dopamine (DA, a contraction of 3,4-dihydroxyphenethylamine) is an organic chemical of the catecholamine and phenethylamine families.
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.