The Ranquil massacre () was a massacre of forestry workers by the Chilean Army in the upper Bio-Bio River in 1934. The upper Bio-Bio region had recently been opened for Chilean and foreign settlers due to the occupation of the Araucania, and huge extensions of former Mapuche land were available. The workers rebelled against the lumber mill administrators, later the Chilean Army was called to restore order. 477 workers and Mapuches were killed as result. Around 500 prisoners were taken.