Fedir Koriatovych also spelled Theodor Koriatovits (Ukrainian: Федір Коріятович, Lithuanian: Teodoras Karijotaitis) (died 1414 in Mukachevo) was a Podolian prince from a Ruthenian branch of the Gediminids dynasty in what is now Ukraine. Son of Karijotas. In 1392 he disobeyed Vytautas the Great and was forced into exile. In 1396, Koriatovych purchased the city of Munkács in the Kingdom of Hungary (today Mukachevo, Ukraine), settling himself in the city's Palanok Castle, which would become one of the most protected castles in the region.