Ivchenko-Progress ZMKB (, Zaporizhzhia Machine-Building Design Bureau "Progress" State Enterprise named after Academician O.H.Ivchenko), formerly OKB-478 and Ivchenko-Lotarev, is a state design bureau that creates drafts and plans for aircraft engines in Zaporizhzhia, Ukraine whose products are widely used in both civil and military aircraft, most notably by Antonov, Beriev, Ilyushin, Tupolev, Mil and Yakovlev. The design bureau works closely with Motor Sich, the turbine manufacturer located in Zaporizhzhia which produces those engines.
Polish manufacturer PZL-Mielec used the Progress ZMKB AI-25TL engine in the PZL M-15 Belphegor cropduster. Both the largest plane in the world, the Antonov An-225 Mriya and the largest helicopter, the Mil Mi-26, are powered by Progress/Lotarev engines.
The bureau is administered by the Ukrainian Defense Industry and the Ministry of Industrial Policy.