Encyclopedias, Almanacs, Transcripts, and Maps
- Klíma, Ivan
- Klinger, Friedrich Maximilian von
- klipspringer
- Klondike Gold Rush National Historical Park
- Kloos, Willem
- Kluane National Park
- Kluckhohn, Clyde Kay Maben
- Klug, Sir Aaron
- klystron
- Knife River Indian Villages National Historic Site
- Knight, Charles
- Knights of Calatrava
- Knights of Columbus
- Knights of Jerusalem
- Knights of Saint John of Jerusalem
- Knights of the Sword
- Knights of the White Camellia
- Kniller, Gottfried von
- Knolles, Sir Robert
- Knowles, William Standish