The Grigorovich M-24 was a Soviet biplane flying boat built during the 1920s.
Flight tests with the aircraft, which featured a 14-metre wingspan and a maximum speed of 160 km/h, began in 1923 and subsequently 40 aircraft were produced, which were delivered from April 1924.
The flight performance was poor, however, and the pilots and maintenance personnel complained about the aircraft's many defects.
Following these complaints, Grigorovich began working on a revised version of the aircraft as the M-24bis.
Twenty of the new aircraft were built, and they were used, until 1926, by the Soviet Navy for coastal reconnaissance.