M55

M55 or M-55 may refer to:

==Military== M55 (rocket), a nerve agent-filled American Cold War-era rocket Myasishchev M-55, a Soviet reconnaissance aircraft M55 self propelled howitzer, an American self-propelled artillery piece M55 machine gun trailer mount, an American quadruple .50 caliber machine gun system based on the M45 Quadmount Zastava M55, a Yugoslav/Serbian anti-aircraft gun Tikka M55, a Finnish rifle M55, a folding stock version of the M50 Reising submachine gun M-55S, a Slovenian tank, a modernization of the T-55 M55 helmet, a Finnish variant of the Stahlhelm