The Geochang massacre was a massacre conducted by the third battalion of the 9th regiment of the 11th Division of the South Korean Army between 9 February 1951 and 11 February 1951 of 719 unarmed citizens in Geochang, South Gyeongsang district of South Korea. The victims included 385 children. The 11th Division also conducted the Sancheong-Hamyang massacre two days earlier. The general commanding the division was Choe Deok-sin.

In June 2010, An Jeong-a, a researcher for the Truth and Reconciliation Commission, disclosed National Defense Ministry official documents on his thesis that the massacre had been done under official South Korean Army order in order to annihilate citizens living in the guerrilla influenced area. On September 9, 2010, An was fired for disclosing Geochang massacre documents. The National Defense Ministry accused An of disclosing the documents which he had been only permitted to view under the condition of nondisclosure.