Battle of Porkuni () was the largest engagement between Estonians serving in the Red Army and Estonian pro-independence and Waffen-SS units. It took place in 21 September 1944 between Lake Porkuni and the Sauvälja village about seven kilometres northeast of the town of Tamsalu during the Leningrad Front's Tallinn Offensive Operation (17 September 1944 – 26 September 1944). The 8th Rifle Corps surrounded about 1,500 Estonians retreating from the Tannenberg line in the Sinimäed Hills. In the ensuing battle, more than 500 surrounded Estonians were killed. Around 700 were captured.