M55

M55 or M-55 may refer to:

• M55 rocket, a nerve agent filled American Cold War-era rocket
• Myasishchev M-55, a Soviet reconnaissance aircraft
• Messier 55 (M55), a globular cluster in the constellation Sagittarius
• a Samsung Sens laptop computer model
• a Soviet artillery piece, see 152 mm towed gun-howitzer M1955 (D-20)
• M55 howitzer, self-propelled artillery

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