DOI or DoI may refer to:

• Doi (土井、土居、土肥^?) is a Japanese surname
• Division of Interest, breakdown of oil/gas royalty and working interest
• Division of Investigation, a precursor to the Federal Bureau of Investigation in the United States.
• New York City Department of Investigation, an agency of the New York City government.
• Declaration of independence, a proclamation or assertion of national independence.
• Declaration of interests (declaration of financial interests), a means of publicizing public officials' potential conflicts of interest.
• United States Department of the Interior, a Cabinet department of the United States government that manages and conserves most federally-owned land.
• Digital object identifier, a persistent identifier given to objects on the Internet.
• 2,5-Dimethoxy-4-iodoamphetamine, a hallucinogenic drug.
• Distinctness of image, a quantification of the deviation of the direction of light propagation by scattering during transmission or reflection.
• Dancing on Ice (UK), a reality television show focussing on ice-skating.
• DÖI, a fictional band from Strong Bad's Cool Game for Attractive People.
• Dogri language ISO 639 code.
• Diffusion of innovations, a theory explaining the spread of new technology.
• Doi (retailer), or Camera no Doi, a Japanese company
• doi:, the prefix of the correct citation of a digital object identifier reference
• Doi (Thai: ดอย) is the name for "mountain" in Northern Thailand

DOI or DoI may refer to:

• Daughters of Iraq, female auxiliary police forces instrumental to stabilizing Iraq.
• Declaration of independence, a proclamation or assertion of national independence
• Declaration of interests, a means of publicizing public officials' potential conflicts of interest
• United States Department of the Interior, a Cabinet department of the United States government that manages and conserves most federally-owned land
• Digital object identifier, a persistent identifier given to objects on the Internet
• 2,5-Dimethoxy-4-iodoamphetamine, a hallucinogenic drug
• Distinctness of image, a quantification of the deviation of the direction of light propagation by scattering during transmission or reflection
• Dancing on Ice, a reality television show focussing on ice-skating.

See also

• Doi (disambiguation)