The Parliament of Yugoslavia was the legislature of Yugoslavia. Before World War II in the Kingdom of Yugoslavia it was known as the National Assembly, while in the Socialist Federal Republic of Yugoslavia the name was changed to Federal Assembly. It functioned from 1920 to 1992 and resided in the building of the House of the National Assembly which subsequently served as the seat of the Parliament of Serbia and Montenegro and since 2006 hosts the National Assembly of Serbia. The Federal Assembly was the highest organ of state power and the only branch of government in the country, with all state organs subservient to it under the principle of unified power as it was a one-party state, with the League of Communists of Yugoslavia as the sole legal party in the country. Most of the Federal Assembly's actions simply rubber stamp the party's decisions.

A legislature is a deliberative assembly with the legal authority to make laws for a political entity such as a country, nation or city. They are often contrasted with the executive and judicial powers of government. Legislatures can exist at different levels of government–national, state/provincial/regional, local, even supranational. Countries differ as to what extent they grant deliberative assemblies at the subnational law-making power, as opposed to purely administrative responsibilities.