K55

K55 or K-55 may refer to:


 * K-55 (Kansas highway)
 * K-55 (missile), a Soviet air-to-air missile
 * K55 howitzer, a South Korean self-propelled gun
 * HMS Periwinkle (K55), a corvette of the Royal Navy
 * Keystone K-55 Pronto, an American biplane
 * Osan Air Base, in South Korea
 * Potassium-55, an isotope of potassium
 * SOVIET SUBMARINE K-55, various vessels
 * K-55, a Billiard table profile