The Abraham Lincoln Brigade refers to volunteers from the United States who served in the Spanish Civil War in the International Brigades. They fought for Spanish Republican forces against Franco and the Spanish Nationalists.
As time went on, the name Abraham Lincoln Brigade became used loosely, in the United States, as shorthand to describe any unit with an American component. Volunteers from the United States also served with the Canadian Mackenzie-Papineau Battalion, the Regiment de Tren (transport), and the John Brown Anti-Aircraft Battery. North Americans also ran a very well-organized and well-equipped field hospital (funded and staffed by the American Medical Bureau to Save Spanish Democracy).