Kasım Pasha or Kasim Pasha (Turkish: Kasım Paşa; fl. 1442–43) was an Ottoman general and governor, the beylerbey of Rumelia and one of the commanders of the Ottoman forces during the Crusade of Varna (1443–44).
When Rumelian beylerbey and vizier Hadım Şehabeddin was defeated by John Hunyadi in 1442, he was replaced by Kasım Pasha at both positions.
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The Battle of Nish (early November 1443) was fought between the Crusaders led by John Hunyadi and Đurađ Branković and the Ottoman Empire led by Kasım Pasha. It saw the Crusaders capture the Ottoman stronghold of Nish (Niš) in Serbia, and defeat two armies of the Ottoman Empire. The Battle of Nish was part of Hunyadi's expedition known as the long campaign. Hunyadi, at the head of the vanguard, crossed the Balkans through the Gate of Trajan, captured Nish, defeated three Ottoman pashas, and after taking Sofia from the Ottomans, united with the royal army and defeated Sultan Murad II at Snaim (Kustinitza). The impatience of the king and the severity of the winter then compelled him (in February 1444) to return home.