An official state car is a vehicle used by a government to transport its head of state or head of government in an official capacity, which may also be used occasionally to transport other members of the government or visiting dignitaries from other countries. A few countries bring their own official state car for state visits to other countries, for instance, the United States, Russia, the United Kingdom, South Korea, Germany and Japan. It also may serve as an automotive symbol of the head of state and their country. An official state car must have adequate security, capability and stateliness for its duty. A limousine or other high-end vehicle is usually selected.

A limousine, or limo for short, is a large, chauffeur-driven luxury vehicle with a partition between the driver compartment and the passenger compartment which can be operated mechanically by hand or by a button electronically. A luxury sedan with a very long wheelbase and driven by a professional driver is called a stretch limousine.