This is a list of countries categorised by system of government.
Contents
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| Name | Constitutional form | Head of state | Basis of executive legitimacy |
|---|---|---|---|
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency is independent of legislature | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Constitutional monarchy | Executive | Monarch personally exercises power in concert with other institutions | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Constitutional monarchy | Executive | Monarch personally exercises power in concert with other institutions | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency and ministry are subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Absolute monarchy | Executive | All authority vested in absolute monarch | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency is independent of legislature | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Power constitutionally linked to a single political movement | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Power constitutionally linked to a single political movement | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| n/a | n/a | n/a No constitutionally-defined basis to current regime | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Constitutional monarchy | Executive | Monarch personally exercises power in concert with other institutions | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Republic | Executive | Presidency and ministry are subject to parliamentary confidence | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Constitutional monarchy | Executive | Monarch personally exercises power in concert with other institutions | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Power constitutionally linked to a single political movement | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Power constitutionally linked to a single political movement | |
| Constitutional monarchy | Executive | Monarch personally exercises power in concert with other institutions | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency and ministry are subject to parliamentary confidence | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency and ministry are subject to parliamentary confidence | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Constitutional monarchy | Executive | Monarch personally exercises power in concert with other institutions | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Constitutional monarchy | Executive | Monarch personally exercises power in concert with other institutions | |
| Republic | Executive | Presidency is independent of legislature | |
| n/a | n/a | n/a No constitutionally-defined basis to current regime | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency and ministry are subject to parliamentary confidence | |
| Republic | Executive | Presidency and ministry are subject to parliamentary confidence | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| n/a | n/a | n/a No constitutionally-defined basis to current regime | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Absolute monarchy | Executive | All authority vested in absolute monarch | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Power constitutionally linked to a single political movement | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Absolute monarchy | Executive | All authority vested in absolute monarch | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency and ministry are subject to parliamentary confidence | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Absolute monarchy | Executive | All authority vested in absolute monarch | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence Stateless society | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency and ministry are subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency and ministry are subject to parliamentary confidence | |
| Absolute monarchy | Executive | All authority vested in absolute monarch | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency and ministry are subject to parliamentary confidence | |
| Republic | Executive | Power constitutionally linked to a single political movement | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency is independent of legislature | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Constitutional monarchy | Executive | Monarch personally exercises power in concert with other institutions | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Power constitutionally linked to a single political movement | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence | |
| Constitutional monarchy | Executive | Monarch personally exercises power in concert with other institutions | |
| Constitutional monarchy | Ceremonial | Ministry is subject to parliamentary confidence | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Ceremonial | Ministry is subject to parliamentary confidence | |
| Constitutional monarchy | Executive | Monarch personally exercises power in concert with other institutions | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Power constitutionally linked to a single political movement | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency is independent of legislature | |
| Republic | Executive | Presidency independent of legislature; ministry subject to parliamentary confidence |

Legend
Note that this chart aims to represent de jure systems of government, not the de facto degree of democracy. Several states constitutionally deemed to be multiparty republics may also be broadly described as authoritarian states.
These are systems in which a president is the active head of the executive branch of government and is elected and remains in office independently of the legislature. The following list includes democratic and non-democratic states:
In full presidential systems, the president is both head of state and head of government. There is generally no prime minister, although if one exists he or she serves purely at the pleasure of the president.
In semi-presidential systems, there is usually both a president and a prime minister. In such systems, the president has genuine executive authority, unlike in a parliamentary republic, but some of the role of a head of government is exercised by the prime minister.
A parliamentary republic is a system in which a prime minister is the active head of the executive branch of government and also leader of the legislature. The president's degree of executive power may range from being reasonably significant (e.g. Pakistan) to little or none at all (eg. Ireland). Where the president holds little executive power, their function is primarily that of a symbolic figurehead.
What would normally be considered a prime minister is given title of president and serves as both the head of state and government.
These are systems in which the head of state is a constitutional monarch; the existence of their office and their ability to exercise their authority is established and constrained by constitutional law.
Systems in which a prime minister is the active head of the executive branch of government. In some cases the prime minister is also leader of the legislature, in other cases the executive branch is clearly separated from legislature although the entire cabinet or individual ministers must step down in the case of vote of no confidence.[9][10] The head of state is a constitutional monarch who only exercises his or her powers with the consent of the government, the people or their representatives.
The prime minister is the nation's active executive but the monarch still has considerable political powers that can be used at their own discretion.
Specifically, monarchies in which the monarch's exercise of power is unconstrained by any substantive constitutional law.
States based on a state religion where the head of state is selected by some form of religious hierarchy.
States in which political power is concentrated within a single political party whose operations are largely fused with the government hierarchy. However, some do have elected governments.
The nation's military control the organs of government and all high-ranking political executives are also members of the military hierarchy.
States which have a system of government which is in transition or turmoil and are classified with the current direction of change.
States in which the federal government shares power with semi-independent regional governments. In many cases, the central government is (in theory) a creation of the regional governments; prime examples are Switzerland and the United States.
States in which the central government has delegated some of its powers to regional governments.
A federacy is a country in which some substates function like states in a federation and others like states in a unitary state.
The European Union is a sui generis entity. It has elements of intergovernmentalism and a semi-presidential system, with the European Council acting as its collective "president" and the president of the European Commission as its "prime minister".
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