DB may refer to:

In science and technology:

  • Decibel (dB), a logarithmic unit of measurement in acoustics and electronics
  • Dubnium (Db), a chemical element
  • DB connector, a size of D-subminiature electrical connector
  • Berkeley DB, a cross-platform embedded database library
  • .db, a database file extension

In entertainment:

  • D♭ (musical note)
  • Daily Bugle, a fictional New York City newspaper
  • The dB's, a power pop band from the 1980s
  • DJ DB, a New York based drum 'n' bass dj

In locations:

  • Daytona Beach, Florida
  • Diamond Bar, California
  • Discovery Bay, a residential development in Hong Kong
  • Dobyns Bennett High School, a high school in Kingsport, Tennessee, USA
  • Dâmboviţa County, a county in Romania, ISO 3166-2:RO code

In business:

  • DB Breweries, a New Zealand company
  • DB Medialab, a Norwegian online media company owned by the newspaper Dagbladet
  • DB Records, a label in Atlanta, Georgia, USA
  • Deutsche Bank, a German bank
  • Diamond Bank of Nigeria
  • Doing Business Report by the World Bank Group
  • Defined benefit pension plan a scheme for retirement plans

In transportation:

  • DB Draw, a bridge over the Passaic River, USA
  • DB (car), a French automobile maker
  • Deutsche Bundesbahn, the national railway company of the Federal Republic of Germany from 1949 until 1994
  • Deutsche Bahn, the major German railway company since 1994
  • David Brown (entrepreneur), one-time owner of car manufacturer Aston Martin, several of whose products carried his initials
  • Dublin Bus, the principal bus operator in the Geater Dublin Area of Ireland

In other uses:

  • db.no, the online version of the Norwegian newspaper Dagbladet
  • ȸ, the db-digraph a ligature of "d" and "b" in African linguistics
  • Defensive back, a position in American football and Canadian football
  • dyne:bolic, a GNU/Linux distribution
  • douche bag, a general insult, especially when texting or other communication media
  • D. B. Cooper, a hijacker