| Subačius | |
| Settlement Type: | City |
| Pushpin Map: | Lithuania |
| Pushpin Map Caption: | Location of Subačius |
| Coordinates: | 55.7667°N 24.75°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Ethnographic region |
| Subdivision Name1: | Aukštaitija |
| Subdivision Type2: | County |
| Subdivision Name2: | Panevėžys County |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Kupiškis district municipality |
| Subdivision Type4: | Eldership |
| Subdivision Name4: | Subačius eldership |
| Subdivision Type6: | Capital of |
| Subdivision Name6: | Subačius eldership |
| Established Date: | 1837 |
| Established Title: | First mentioned |
| Established Date2: | 1958 |
| Established Title2: | Granted city rights |
| Population Total: | 865 |
| Population As Of: | 2022 |
| Timezone: | EET |
| Utc Offset: | +2 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +3 |
Subačius (; Polish: Subocz) is a small town in Panevėžys County, northwestern Lithuania. It is located on the banks of the Viešinta River about 14km (09miles) 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.[1]