Encyclopedias, Almanacs, Transcripts, and Maps
- Lead Management
- Lead Shot
- leaf hopper
- Leafy Spurge
- League of Conservation Voters
- Leakey, Louis Seymour Bazett (1903 – 1972) African-Born English Paleontologist and Anthropologist
- Leakey, Mary Douglas Nicol (1913 – 1996) English Paleontologist and Anthropologist
- Leakey, Richard Erskine Frere (1944 – ) African-Born English Paleontologist and Anthropologist
- Leaking Underground Storage Tank
- least populous countries
- Leatherback Seaturtles (Dermochelyidae)
- Leclanché cell
- Ledbetter, Huddie
- Leenhardt, Maurice
- Leeser, Isaac
- Leeuw, Gerardus van der
- Left and Right
- Legalism
- legion of honour
- Legitimation