The Sacco-Vanzetti Battalion (Basque: Sacco-Vanzetti Batailoia) was a military unit of the National Confederation of Labor (CNT) from Euskadi that acted on the Northern Front during the Spanish Civil War.

[1] The Sacco-Vanzetti battalion, 4th of the battalions organized by the CNT in Euzkadi, was completed based on companies from Gipuzkoa and new ones organized in Bizkaia.

The battalion distinguished itself in December 1936, during the Battle of Legutiano, fighting for Cestafé and Nafarrate, and suffering no less than 150 casualties.

The Sacco-Vanzetti battalion then marched to the Udala area, fighting in the third decade of April for Karraskain, suffering heavy casualties that forced them to withdraw.

Later, the unit fought in Urrutxua, Bizkargi and, merged with the Durruti Battalion in Santander, during the Battle of Kolitza.