The 18th (Croatian) Eastern Bosnian Brigade was a World War II military unit of the Yugoslav Partisans.
The formation of the unit allowed the Partisans to liberate the lightly guarded city of Tuzla and hold it for 40 days, before the Germans retook it in Operation Ferkel.
During these forty days, the Partisans mobilised over 5,000 citizens of Tuzla and neighboring villages from which a total of three brigades would be formed and become the 27th Eastern Bosnian Division.
The Brigade's first casualty was not suffered in combat, Stjepan Presečen from the 2nd Battalion died from a heart attack during the march to Bresko.
Some twenty men deserted brigade during the first week of its existence, forcing the staff to work on discipline and moral.