The Grigorovich M-24 was a Soviet biplane flying boat built during the 1920s. Dmitri Grigorovich began developing the aircraft in April 1922, whilst he was flying the successful Grigorovich M-9. 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.