Janusz Kiszka (1586-13 January 1654) was a Polish-Lithuanian nobleman and magnate. The son of Stanislaw Kiszka, he was raised a Calvinist Protestant and converted to Catholicism in 1606. He fought at the 1604 Battle of Weissenstein, the 1605 Battle of Kircholm, and the 1611 and 1618 expeditions against Moscow. He went on to become Voivode of Polock, fighting against Gustavus Adolphus of Sweden at Mitau (Jelgava) in 1622. King Wladyslaw IV Vasa appointed Kiszka Field Hetman of Lithuania in 1635, and remained idle during the Khmelnytsky Uprising before dying in 1654.