Hassling-Ketling of Elgin (died 26 August 1672) was a Scottish artillery officer in the service of the Polish-Lithuanian Crown Army. He befriended Jerzy Wołodyjowski, and their friendship survived Ketling's romance with Wołodyjowski's former fiancee Krystyna Drohojowska, who eventually married Ketling with Wołodyjowski's permission. Ketling and Wołodyjowski later defended Kamieniec Podolski fortress from the Ottoman Turks, and the two men swore to defend the fortress to the death. After the fortress' surrender, the two men blew up the castle and themselves with it, faithful to their earlier oaths.