Parliamentary systems where a prime minister serves as head of government are found across the globe, spanning diverse continents, cultures, and political histories. The following nations currently operate under a prime ministerial system (though specific powers and titles may vary):
Note: Some countries listed (e.g., China) have a premier rather than a prime minister, and the role's authority differs significantly between constitutional monarchies and republics. This list represents nations where the title "Prime Minister" (or direct equivalent) is used for the head of government.