The National Liberation Front, also known as the People's Liberation Front, was a communist political and military organization created by the Slavic Macedonian minority in Greece. The organization operated from 1945–1949, most prominently in the Greek Civil War. As far as its ruling cadres were concerned its participation in the Greek Civil War was nationalist rather than communist, with the goal of secession from Greece.

Slavic speakers are a minority population in the northern Greek region of Macedonia, who are mostly concentrated in certain parts of the peripheries of West and Central Macedonia, adjacent to the territory of the state of North Macedonia. Their dialects are called today "Slavic" in Greece, while generally they are considered Macedonian. Some members have formed their own emigrant communities in neighbouring countries, as well as further abroad.