Taras Fedorovych (pseudonym, Taras Triasylo, Hassan Tarasa, Assan Trasso) (Ukrainian: Тара́с Федоро́вич, Polish: Taras Fedorowicz) (died after 1636) was a prominent leader of the Dnieper Cossacks, a popular Hetman (Cossack leader) elected by unregistered Cossacks.
Between 1629 and 1636, Fedorovych played a key role in the regional conflicts involving the rebellion of the Ruthenian (Ukrainian) Cossacks and peasants against the Polish rule over the Dnieper Ukraine territory as well as in the conflicts that included the Polish–Lithuanian Commonwealth, the Tsardom of Russia and the Ukrainians torn between those two neighbors.
With many circumstances of his life remaining mysterious to this day, Fedorovych is a revered figure in both Ukrainian folklore and in the Ukrainian national idea, a hero of poems by Taras Shevchenko, a personage of the earliest Ukrainian motion picture and one of only four Cossack leaders explicitly mentioned in the Pavlo Chubynsky poem that later became the basis of the modern National Anthem of Ukraine.