Encyclopedias, Almanacs, Transcripts, and Maps
- Luba Religion
- Ludi Saeculares
- Lugbara Religion
- Lugh
- lugworm
- Luke the Evangelist
- lumbago
- Lumière, Louis Jean and Auguste
- lumpfish
- Lungless Salamanders (Plethodontidae)
- lupus erythematosus
- lupus vulgaris
- Luria, Isaac
- Luria, Shelomoh
- Lustratio
- lux
- Lycopodophyta
- Lyell, Charles (1797–1875)
- Lyell, Sir Charles (1797 – 1875) Scottish Geologist
- lymph gland