The Big Swords Society () or Great Knife Society was a traditional peasant group most noted for the killing of two German Catholic missionaries at the Juye Incident in 1897 at Zhang Jia Village where the missionaries were ambushed in their sleep by about 30 armed men. The Big Swords Society was widespread in North China during the Qing Dynasty and noted for its reckless courage. Rather than one large overarching organization, the Big Swords were local groups of small-holders and tenant farmers organized to defend villages against roaming bandits, warlords, tax collectors or later the Communists and Japanese.
