The Yugoslav volunteers in the Spanish Civil War, known as Spanish fighters (Croatian: Španjolski borci, Slovenian: Španski borci, Serbian: Шпански борци|separator=" / "|Španski borci) and Yugoslav brigadistas (Spanish; Castilian: brigadistas yugoslavos), was a contingent of volunteers from the Kingdom of Yugoslavia that fought for the Republicans (in support of the Second Spanish Republic) during the Spanish Civil War (1936–1939). An estimated 1,664[1] "Yugoslav brigadistas" fought in the war, out of whom c. 800 were killed in action. According to Spanish statistics, 148 Yugoslav volunteers received the officer rank during the conflict. Most of them fought in the battalions Dimitrov and Đuro Đaković of the International Brigades, and many of them participated and perished during the Battle of Ebro in 1938. They were recruited by the outlawed Communist Party of Yugoslavia in their home regions or through the recruitment centre of the Comintern that Josip Broz Tito managed in Paris. There were four airmen among the volunteers the most notable one being the fighter pilot Božidar "Boško" Petrović, who attained the status flying ace.
After the war, those who managed to flee across the Pyrenees, fell captive in internment camps in France, where the Yugoslav communist organisation illegally repatriated many of them. Some of whom became leaders of the resistance against the Nazi occupation. Three members of the International brigades that fought on the Republican side ended up commanding the four armies of the Partisan Liberation Army, which fought the Nazis in World War II: Peko Dapčević, Kosta Nađ and Petar Drapšin. Koča Popović was the partisan commander who was fighting for the Spanish Republican Armed Forces.[2]
According to Spanish statistics, 1052 Yugoslavs were recorded as volunteers of which 48% were from what, after 1945, became Croatia, 23% Slovenia, 18% Serbia, 2.3% Montenegro and 1.5% Macedonia.[3]