DOI

DOI or Doi most commonly refers to: It may also refer to:
 * Declaration of Independence, a document to be independent from another country
 * Digital object identifier, an international standard for document identification
 * United States Department of the Interior, an executive department of the U.S. government

Science and technology

 * Distinctness of image, a quantification of vision used in optics
 * 2,5-Dimethoxy-4-iodoamphetamine, a hallucinogenic drug

Organizations

 * Department of Information (Australia), Australian government department, 1939–1950
 * Division of Investigation, a precursor to the U.S. Federal Bureau of Investigation
 * New York City Department of Investigation, law enforcement agency

Other uses

 * Dancing on Ice, a British television series
 * Doi (surname), a Japanese surname
 * Doi (retailer), a Japanese company
 * Doi (clan), a clan of the Gurjar ethnic group
 * Dogri language (ISO 639 code), spoken in India and Pakistan