The Communist Party of Ukraine (Ukrainian: Комуністична Партія України, romanized: Komunistychna Partiya Ukrayiny, КПУ, KPU; Russian: Коммунистическая партия Украины, romanized: Kommunisticheskaya partiya Ukrainy) was the founding and ruling political party of the Ukrainian SSR operated as a republican branch (union republics) of the Communist Party of the Soviet Union (CPSU).
Founded as the Communist Party (Bolsheviks) of Ukraine (CP(b)U) in 1918 in Moscow, Russian SFSR, it was the sole governing party in Ukraine during its time in Soviet Russia and the Soviet Union. While the anti-Bolshevik Ukrainian People's Republic had its own political parties of socialist ideologies, the Communist Party of Ukraine was created out of the party of Russian Bolsheviks in Ukraine known as the RSDRP(b) – Social-Democracy of Ukraine. The party was denied the right to have a separate party statute and was governed by the statute of the Russian Communist Party (Bolsheviks), All-Union Communist Party (Bolsheviks) and Communist Party of the Soviet Union. In 1952, the party was renamed as the Communist Party of Ukraine.