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

Science and technology

 * Messier 55 (M55), a globular cluster in the constellation Sagittarius
 * M55, a Samsung Sens laptop computer model
 * Siemens M55, a mobile phone
 * Cortex-M55, an ARM Cortex-M processor core
 * ThinkCentre M55, a ThinkCentre M series PC

Transportation

 * M55 (New York City bus), a New York City Bus route in Manhattan

Roads

 * M55 motorway, a road in Lancashire, United Kingdom, connecting Blackpool and the M6 at Preston
 * M55 highway (Russia), a 1113 km road connecting Irkutsk and Chita
 * M-55 (Michigan highway), a road in Michigan connecting Lake Huron and Lake Michigan
 * M55 (Cape Town), a Metropolitan Route in Cape Town, South Africa

Other uses

 * M 55, an age group for Masters athletics