The Myasishchev M-55 is a high-altitude reconnaissance aircraft developed by OKB Myasishchev in the Soviet Union, similar in mission to the Lockheed ER-2, but with a twin-boom fuselage and tail surface design. It is a twin-engined development of the Myasishchev M-17 Stratosphera with a higher maximum take-off weight.

V. M. Myasishchev Experimental Design Bureau or OKB-23, founded in 1951 by MGB UdSSR Vladimir Myasishchev, was one of the chief Soviet aerospace design bureaus until its dissolution in 1960. Vladimir Myasishchev went on to head TsAGI. In 1967, Myasishchev left TsAGI and recreated his bureau, which still exists to this day. The bureau prefix was "M." As of 2003, its workforce is estimated at approx­imately one thousand. Myasishchev and NPO Molniya intend to use the V-MT or M-55 as launch vehicle for sub-orbital spaceflight.