Sulo Kolkka was a Finnish soldier in the Winter War.

During 105 days of combat Kolkka was credited with more than 400 enemy kills as a sniper in the Winter War. He used an iron sighted Mosin-Nagant rifle. He often took the war to the rear of the Soviet lines, causing much fear and frustration as this area was supposedly safe. In addition to the kills he made as a sniper, Kolkka also was apparently quite fond of the submachine gun as he made an additional 200 kills with it during this same time frame. Hunted often by the Soviets, he outlasted them all, killing the sniper sent to hunt him at 550 m (600 yards) with a single shot after a running duel of several days. Like Simo Häyhä, Sulo Kolkka exhibited the hard determination and skill that kept Finland a sovereign nation even after its inevitable defeat. At the end of the Winter War a Soviet General is said to have quipped, "We gained 57,000 km² (22,000 square miles) of territory. Just enough to bury our dead".