K

- KAI KT-1 Woong-Bee
- KAI Surion

- KAI T-50 Golden Eagle
- Kaiser-Fleetwings XBTK
- Kalinin K-4

- Kalinin K-7
- Kalinin K-12 / VS-2 Zhar-Ptitsa / Firebird

- Kaman HH-43 Huskie

- Kaman K-1200 K-max

- Kaman K-240 / HTK-1

- Kaman SH-2 Seasprite
- Kaman SH-2G Super Seasprite
- Kamov A-7

- Kamov Ka-10 Hat

- Kamov Ka-115 Moskvichka
- Kamov Ka-126 Hoodlum-B

- Kamov Ka-137

- Kamov Ka-15 Hen

- Kamov Ka-18 Hog
- Kamov Ka-20 Harp

- Kamov Ka-22 Vintokryl / Hoop

- Kamov Ka-25 Hormone

- Kamov Ka-26 Hoodlum-A

- Kamov Ka-226 Sergei

- Kamov Ka-27 Helix-A / Ka-29 Helix-B / Ka-32 Helix-C
- Kamov Ka-31 Helix

- Kamov Ka-50 Hokum / Black Shark

- Kamov Ka-52 Alligator / Hokum-B

- Kamov Ka-60 Kasatka

- Kawanishi H6K Mavis

- Kawanishi H8K Emily
- Kawanishi N1K-J Shiden / George

- Kawasaki Asuka
- Kawasaki Ki-10 Perry

- Kawasaki Ki-100

- Kawasaki Ki-32 Mary

- Kawasaki Ki-45 Toryu / Nick

- Kawasaki Ki-48 Sokei / Lily

- Kawasaki Ki-61 Hien / Tony
- Kawasaki KH-4

- Kawasaki KV-107

- Kawasaki C-1

- Kawasaki OH-1 Ninja
- Kawasaki P-2J Neptune

- Kawasaki T-4
- Kawasaki XC-2

- Kawasaki XP-1 / P-X

- Kayaba Ka-1 / Ka-GO
- Kazan Aktai

- Kazan Ansat 2RC
- Kellett KD-1

- Kellett XR-8 Egg-beater
- Kellett XR-10
- Kingsford Smith PL-7 Tanker
- Klemm Kl-32

- Klemm Kl-35
- Klemm L-20

- Klemm L-25

- KM Caspian Sea Monster
- Kobeseiko Te-Go
- Kochyerigin-Yatsenko DI-6 / TsKB-11
- Kokusai Ki-76 Stella

- Kokusai Ta-Go
- Koolhoven FK-49
- Koolhoven FK-55

- Koolhoven FK-58

- Kyushu J7W1 Shinden

- Kyushu K11W Shiragiku

- Kyushu Q1W Tokai