- Kitchenware
- Kitsch
- Kitten
- Knacker's yard
- Knackered
- Knackers yard
- Knavish
- Knee-breeches
- Knee-deep
- Kneecap
- Kneel down
- Knelt
- Knick knack
- Knife-edge
- Knightly
- Knock about
- Knock off
- Knock the spots off
- Knock-up
- Knockout
- Knot
- Knottiest
- Know a person by name
- Know a thing or two
- Know inside out
- Know ones onions
- Know ones own mind
- Know the place like the back of ones hand
- Know the time of day
- Know what one is talking about
- Knower
- Knuckle
- Knuckle-under
- Kohinoor
- Kohlrabi
- Konganadu
- Kookaburra
- Kowtow
- Kremlin
- Krm
- Kuiper belt
- Kunti
- Kuruksethra
- Kusa grass
- Kw
- Kalam
- Kabala
- Kabuki
- Kaftan
- Kaizen
- Kalari
- Kalarippayattu
- Kalinga in north india
- Kalopsia
- Kamadeva
- Kamparamayana
- Kanchipuram
- Kangaroo court
- Kangaroo rat
- Kannada
- Kanni
- Kapsa
- Karakas
- Karat
- Karkidakam
- Karkkadagam
- Karna
- Karnataka
- Karthikeya
- Kaurava
- Kaveri
- Kayak
- Kayamkulam
- Kb
- Keep
- Keep a cool head
- Keep a tight rein on
- Keep an eye on
- Keep at arms length
- Keep away from
- Keep down
- Keep good time
- Keep in touch
- Keep ones mouth shut
- Keep or make a house
- Keep person sweet
- Keep regular hours
- Keep something under wraps
- Keep the flag flying
- Keep the wolf from the door
- Keep time
- Keep to
- Keep to oneself
- Keeping off
- Keepsake
- Keg
- Kelp
- Kelvin
- Kerala
- Keralite