In political science, a political system means the form of political organization that can be observed, recognised or otherwise declared by a society or state.

It defines the process for making official government decisions. It usually comprizes the governmental legal and economic system, social and cultural system, and other state and government specific systems. However, this is a very simplified view of a much more complex system of categories involving the questions of who should have authority and what the government influence on its people and economy should be.

Along with a basic sociological and socio-anthropological classification, political systems can be classified on a social-cultural axis relative to the liberal values prevalent in the Western world, where the spectrum is represented as a continuum between political systems recognized as democracies, totalitarian regimes and, sitting between these two, authoritarian regimes, with a variety of hybrid regimes; and monarchies may be also included as a standalone entity or as a hybrid system of the main three.

According to David Easton, "A political system can be designated as the interactions through which values are authoritatively allocated for a society". Political system refers broadly to the process by which laws are made and public resources allocated in society, and to the relationships among those involved in making these decisions.

Social anthropologists generally recognize several kinds of political systems, often differentiating between ones that they consider uncentralized and ones they consider centralized.

The sociological interest in political systems is figuring out who holds power within the relationship between the government and its people and how the government’s power is used. According to Yale professor Juan José Linz, there are three main types of political systems today: democracies, totalitarian regimes and, sitting between these two, authoritarian regimes (with hybrid regimes). Another modern classification system includes monarchies as a standalone entity or as a hybrid system of the main three. Scholars generally refer to a dictatorship as either a form of authoritarianism or totalitarianism.

A monarchy is a hereditary form of government in which political power is legally passed on to the family members of the monarch, a head of state who rules for life. While monarchs gain their power depending on specific succession laws, they can also gain their authority via election.

A hybrid regime is a type of political system often created as a result of an incomplete democratic transition from an authoritarian regime to a democratic one (or vice versa). Hybrid regimes are categorized as having a combination of autocratic features with democratic ones and can simultaneously hold political repressions and regular elections. According to some definitions and measures, hybrid regimes are commonly found in developing countries with abundant natural resources such as petro-states. Although these regimes experience civil unrest, they may be relatively stable and tenacious for decades at a time. There has been a rise in hybrid regimes since the end of the Cold War.