The Mikulin M-17 is a Soviet aircraft engine designed in the 1930s. It is a liquid-cooled V12 engine, primarily used in military aircraft during World War II. The M-17 was known for its reliability and power, making it suitable for various fighter and bomber planes. This engine was a development of the earlier Mikulin M-15 and was used in notable aircraft such as the Tupolev TB-3 and the Polikarpov I-153. Its design contributed to the performance of these aircraft, helping the Soviet Union in its aerial operations during the war.