The IV Corps was a formation of the Finnish Army during the Winter War against the Soviet Union. It defended the area north of Lake Ladoga against Soviet attacks. It was commanded by Major General Juho Heiskanen and from 4 December 1939 by Major General Woldemar Hägglund. The IV Corps defeated superior Soviet troops by using motti tactics.
Also attached to the corps was Group Talvela commanded by Commander Paavo Talvela. Group Talvela covered the IV Corps northern flank up to the forces of the North Karelian Group. Group Talvela defeated a Soviet Division in the Battle of Tolvajärvi, one of the first Finnish victories of the war. Group Talvelas order of battle: