LDA

• 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