Yuri Nemyrych (Ukrainian: Юрій Стефанович Немирич, Polish: Jerzy Niemirycz) (1612–1659) was a Polish-Ruthenian magnate and politician.
Jerzy Niemirycz (Ukrainian Yuri Nemyrych) was born in Ovruch, Podolia in 1612 during the Polish-Lithuanian intervention in Muscovy, the oldest son of wealthy Polish-Lithuanian Anti-Trinitarians noble family, Klamry coat of arms. His father was a podkomorzy of Kiev Stefan Niemirycz (died 1630) and his mother was Maria Wojnarowska, (died 1632). He studied at the Racovian Academy in Raków, Kielce County, then in Leiden, and travelled across Western and Southern Europe, and then back at Leiden. He has shown great interest in politics, evidenced by his work Discursus de bello Moscovitico, written in 1633 and dedicated to his uncle and fellow Polish Brethren Roman Hojski. Upon his return home, Polish–Lithuanian Commonwealth, in 1634, he was already a well-educated lower level magnate and aspiring Polish-Ruthenian politician (gente Ruthenus natione Polonus), and a model noble citizen. He defended the country in the war against Russian aggression (Smolensk War) and then Sweden (Treaty of Stuhmsdorf). At the end of hostilities he married Calvinist Elżbieta Słupecka, who connected him with them most prominent noble Protestant families of Polish-Lithuanian Commonwealth. In 1636 Kiev voivodeship nobility elected him a judge to the Crown Tribunal (Trybunał Koronny) in Lublin. He performance as a judge found him more favour with his electorate, for in 1637 he was elected to the parliament (Sejm) where he presided for many years. He also became a podkomorzy (chamberlain) of Kiev and exerted significant influence in the Polish–Lithuanian Commonwealth politics. He worked to enhance his family fortune, centred in Horoszki, and through acquisitions and other means his estates grew to include 14 cities and 50 villages with 7600 serfs, so by 1648 he had the second largest territory in the Ukraine, after the Wiśniowiecki family.