| Massacre of the First Sapper Battalion | |
|---|---|
| Part of the Greek Civil War | |
 Makronisos Prison Camp | |
  Location of Makronisos within Greece | |
| Location | Makronisos, Kingdom of Greece |
| Date | 29 February – 1 March 1948 |
| Target | Prisoners |
Attack type | Summary executions |
| Deaths | 350 |
| Perpetrators | Third Sapper Battalion Prison Guards |
The Massacre of the First Sapper Battalion was the mass murder of 350 Greek soldiers imprisoned in the Makronisos prison island perpetrated by the camp guards and prisoner functionaries belonging to the Third Sapper Battalion. The massacre took place between 29 February and 1 March 1948, during the Greek Civil War.