Ba'athism, also spelled Baathism, is an Arab nationalist ideology which advocates the establishment of a unified Arab state through the rule of a Ba'athist vanguard party operating under a revolutionary socialist framework. The ideology is officially based on the theories of the Syrian intellectuals Michel Aflaq (per the Iraqi-led Ba'ath Party), Zaki al-Arsuzi (per the Syrian-led Ba'ath Party), and Salah al-Din al-Bitar. Ba'athist leaders of the modern era include the former president of Iraq Saddam Hussein, and former presidents of Syria Hafez al-Assad and his son Bashar al-Assad.
The Ba'athist ideology advocates the "enlightenment of the Arabs" as well as the renaissance of their culture, values and society. It also advocates the creation of one-party states and rejects political pluralism in an unspecified length of time—the Ba'ath party theoretically uses an unspecified amount of time to develop an "enlightened" Arab society. Ba'athism is founded on the principles of Arab nationalism, pan-Arabism, and Arab socialism, as exemplified by its slogan "Unity, Freedom, Socialism".