Encyclopedias, Almanacs, Transcripts, and Maps
- Kutusov, Mikhail Illarionovich
- Kūya
- Kuznetsov, Anatoly
- Kwa languages
- Kyoto Protocol/Treaty
- La Niña
- La Niña
- La Paz Agreement
- La Vallée Poussin, Louis de
- Labroidei I (Cichlids and Surfperches)
- Labroidei II (Damselfishes, Wrasses, Parrotfishes, and Rock Whitings)
- lacemaking
- lacewing
- lachrymal gland
- Lady Day
- Lady of the Animals
- ladys smock
- Laestadius, Lars Levi
- Lafayette, Marie Joseph Gilbert de Motier, Marquis de
- Lagomorpha (Pikas, rabbits, and hares)