- krebs cycle
- kreisler
- krishna
- krill
- krigia dandelion
- krigia bulbosa
- kroeber
- krishnaism
- kriti
- kronecker
- kriss kringle
- kronecker delta
- kopeck
- kopek
- kroto
- koopmans
- kropotkin
- koppie
- korbut
- kopje
- koran
- koplik's spots
- kordofan
- kordofanian
- korda
- korean
- korean strait
- kore
- korea bay
- korea strait
- korean lespedeza
- korean war
- korinthos
- korean velvet grass
- korsakov's psychosis
- korsakov's syndrome
- korsakoff's syndrome
- korsakoff's psychosis
- korzybski
- kosteletzya virginica
- kosovo
- kota
- kos
- kosciuszko
- kosciusko
- kosher
- kotar
- kotex
- koto player
- key fruit