Encyclopedias, Almanacs, Transcripts, and Maps
- 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
- Knox, Frank
- Knyphausen, Wilhelm, Baron von
- Ko-chiu
- kob
- Kobayashi, Makoto
- Koberger, Anton
- Kobilka, Brian Kent
- Kobo-Daishi