Petro Dyachenko (Ukrainian: Петро́ Дяче́нко, Polish: Petro Diaczenko, January 30, 1895 in Berezova Luka, Poltava Governorate, Russian Empire (present-day Ukraine) – April 23, 1965 in Philadelphia, USA) was a Ukrainian military commander who served as a staff captain in the Russian Army (World War I), colonel in the Ukrainian People's Army (1918–1920), major in the Polish Army (1938–1939), colonel in the Ukrainian Liberation Army (1943–1945), the 104th Panzergrenadier brigade Vilna Ukraina (1945), and general in the Ukrainian National Army (1945).In the First World War Dyachenko was the commander of the Russian 333rd Infantry Regiment.