K4

K4 or K-4 may refer to:

==Military== Daewoo K4, a South Korean automatic grenade launcher HMS K4, a 1915 British K class submarine K 4 or Norrland Dragoon Regiment, a Swedish Army cavalry regiment K-4 (SLBM), an Indian submarine-launched ballistic missile USS K-4 (SS-35), a 1914 United States Navy K-class submarine