The Socialist Republic of Macedonia (Macedonian: , romanized: Socijalistika Republika Makedonija), or SR Macedonia, commonly referred to as Socialist Macedonia or Yugoslav Macedonia, was one of the six constituent republics of the post-World War II Socialist Federal Republic of Yugoslavia, and a nation state of the Macedonians. After the transition of the political system to parliamentary democracy in 1990, the Republic changed its official name to Republic of Macedonia in 1991, and with the beginning of the breakup of Yugoslavia, it declared itself an independent country and held a referendum on 8 September 1991 on which a sovereign and independent state of Macedonia, with a right to enter into any alliance with sovereign states of Yugoslavia was approved.

Geographically, SR Macedonia bordered Albania to the west, Greece to the south and Bulgaria to the east. Within Yugoslavia, it bordered SR Serbia (including SAP Kosovo) to the north. It was one of two constituent countries of Yugoslavia that were landlocked.

The Anti-fascist Assembly for the National Liberation of Macedonia (Macedonian: Антифашистичко собрание за народно ослободување на Македонија (АСНОМ), Antifašističko sobranie za narodno osloboduvanje na Makedonija; Serbo-Croatian: Antifašističko sobranje narodnog oslobođenja Makedonije; abbr. ASNOM) was the supreme legislative and executive people's representative body of the communist Macedonian state from August 1944 until the end of World War II. The body was set up by the Macedonian Partisans during the final stages of the World War II in Yugoslav Macedonia. That occurred clandestinely in August 1944, in the Bulgarian occupation zone of Yugoslavia. Simultaneously another state was declared by pro-Nazi Germany Macedonian right-wing nationalists.