LDA may refer to:

Aviation

  • Localizer type directional aid, a landing procedure
  • Landing distance available, a runway length

Law

  • Legal document assistant, an independent paralegal role
  • Lobbying Disclosure Act of 1995, United States
  • Legal drinking age, a minimum age of alcohol consumption

Music

  • LDA (singer) (born 2003)
  • Little Dark Age, a 2018 MGMT album

Organizations

  • Lahore Development Authority, agency in Lahore, Pakistan
  • Left Democratic Alliance, left-wing political alliance in Bangladesh
  • Liga Deportiva Alajuelense, a Costa Rican football club
  • London Democratic Association, 19th century organisation in England
  • London Development Agency, regional development agency for the London region in England
  • Lord's Day Alliance, an ecumenical Christian first-day Sabbatarian organization

Science and technology

  • Laser Doppler anemometry, to measure velocity
  • Latent Dirichlet allocation, in natural language processing
  • Left-displaced abomasum, a condition of ruminants
  • Linear diode array, in X-ray imaging
  • Linear discriminant analysis, in statistics
  • Lithium diisopropylamide, a chemical base
  • Local delivery agent, in e-mail
  • Local-density approximation, in quantum mechanics
  • Low density amorphous ice, a solid phase of water
  • Lobate debris apron, a Martian landform
  • Low dose allergens, a variant of enzyme potentiated desensitization