This is a list of sovereign states by constitutionally defined de jure system of government. This list does not measure degree of democracy, political corruption, or state capacity of governments. See more

Semi-presidential republics
In a semi-presidential republic a president exists alongside a prime minister and a cabinet, … See more

States that have a system of government that is in transition or turmoil. These regimes lack a constitutional basis.
• Afghanistan, Islamic Emirate of
• Haiti See more

The exact political character of the European Union is debated, some arguing that it is sui generis (unique), but others arguing that it has … See more

Constitutional monarchies
These are systems in which the head of state is a constitutional monarch; the existence of their … See more

Specifically, monarchies in which the monarch's exercise of power is unconstrained by any substantive constitutional law. … See more

Unitary states
A state governed as a single power in which the central government is ultimately supreme and any See more