LDA

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

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

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

• Lahore Development Authority, agency in Lahore, Pakistan
• 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

• 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

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