Subačius (pronunciation; Polish: Subocz) is a small town in Panevėžys County, northwestern Lithuania. It is located on the banks of the Viešinta River about 14 km (8.7 mi) west of Kupiškis.

During World War II, the Jewish community was murdered in a mass execution perpetrated by an Einsatzgruppen of Germans helped by Lithuanian nationalists. Some Jews were shot dead near the town's railway station. Others were transported to Kupiškis, where they were murdered. 80 people were massacred, a monument was built on the execution site.