LDA
- LDA (singer)
- Lahore Development Authority
- Landing distance available
- Laser Doppler anemometry
- Latent Dirichlet allocation
- Left Democratic Alliance (Bangladesh)
- Left-displaced abomasum
- Legal document assistant
- Legal drinking age
- Liga Deportiva Alajuelense
- Linear diode array
- Linear discriminant analysis
- Lithium diisopropylamide
- Little Dark Age
- Lobate debris apron
- Lobbying Disclosure Act of 1995
- Local delivery agent
- Local-density approximation
- Localizer type directional aid
- London Democratic Association
- London Development Agency
- Lord's Day Alliance
- Low density amorphous ice