DNA (or deoxyribonucleic acid or deoxyribose nucleic acid) is a nucleic acid that contains the genetic instructions specifying the biological development of all cellular forms of life.

DNA as a three-letter abbreviation or a part of a proper name may also refer to:

• Dynamic Numeric Authentication, a method of verifing checks and other written documents digitally.
• Design and Architecture, a radio show on Los Angeles public radio station KCRW.
• DNA Studio, an advertising agency.
• Democratic National Assembly, a political party in Trinidad and Tobago.
• DNA Insurance Services Ltd. - An Essex based insurance brokerage specialising in cars, bikes and vans.
• DNA, an Indian Newspaper based in Mumbai
• DNA Magazine, an Australian magazine for gay men.
• DNA, a rock music group founded in New York City and associated with No Wave
• DNA, Drugs 'n' alcohol
• DNA, a British duo who charted in the UK with a dance remix of "Tom's Diner"
• DNA computing, a form of computing which uses DNA and molecular biology instead of the traditional silicon-based computer technologies
• "Distributed interNet Application", a defunct predecessor of the Microsoft .NET Framework
• Digital Network Architecture, a DECnet network architecture by Digital Equipment Corporation
• the genes and gene products (proteins) involved in DNA replication:
  • protein DnaA and gene dnaA
  • protein DnaB helicase and gene dnaB
  • protein DnaC and gene dnaC
  • protein DnaG and gene dnaG
• The Norwegian Labour Party, Det norske Arbeiderparti
• Douglas Noël Adams, author of The Hitchhiker's Guide to the Galaxy
• Genentech has the stock ticker symbol DNA
• Runtime DNA is a CGI art forum.
• DNA: The Secret of Life, a book on DNA by James D. Watson
• Distanced Networking Applications, a computer term.
• Various animes:
  • DNA²
  • D.N.Angel
• The Detroit Newspaper Agency, which resulted from the joint operating agreement of the two leading Detroit newspapers (the Detroit Free Press and Detroit News).

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