Ksudach () (also known as Vonyuchy Khrebet Volcano) is a stratovolcano in southern Kamchatka, Russia. The last eruption of Ksudach was in March 1907, on or around 28 March, which was one of the largest ever recorded in Kamchatka, with a Volcanic Explosivity Index of 5 and a volume of ejected ash at . The 1907 eruption sent ash high into the atmosphere which was transported by the jet stream, leaving North America east of the Rocky Mountains unseasonably cold.