Far-right politics, often termed right-wing extremism, encompasses a range of ideologies that are marked by ultraconservatism, authoritarianism, ultranationalism, radical anti-communism, ethnonationalism, and nativism. This political spectrum situates itself on the far end of the right, distinguished from more mainstream right-wing ideologies by its opposition to liberal democratic norms and emphasis on exclusivist views. Far-right ideologies have historically included reactionary conservatism, fascism, and Nazism, while contemporary manifestations also incorporate neo-fascism, neo-Nazism, supremacism, and various other movements characterized by chauvinism, xenophobia, and theocratic or reactionary beliefs.

Key to the far-right worldview is the notion of societal purity, often invoking ideas of a homogeneous "national" or "ethnic" community. This view generally promotes organicism, which perceives society as a unified, natural entity under threat from diversity or modern pluralism. Far-right movements frequently target perceived threats to their idealized community, whether ethnic, religious, or cultural, leading to anti-immigrant sentiments, welfare chauvinism, and, in extreme cases, political violence or oppression. According to political theorists, the far right appeals to those who believe in maintaining strict cultural and ethnic divisions and a return to traditional social hierarchies and values.

In practice, far-right movements differ widely by region and historical context. In Western Europe, they have often focused on anti-immigration and anti-globalism, while in Eastern Europe, strong anti-communist rhetoric is more common. The United States has seen a unique evolution of far-right movements that emphasize nativism and radical opposition to central government.

Far-right politics have led to oppression, political violence, forced assimilation, ethnic cleansing, and genocide against groups of people based on their supposed inferiority or their perceived threat to the native ethnic group, nation, state, national religion, dominant culture, or conservative social institutions. Across these contexts, far-right politics has continued to influence discourse, occasionally achieving electoral success and prompting significant debate over its place in democratic societies.

According to scholars Jean-Yves Camus and Nicolas Lebourg, the core of the far right's worldview is organicism, the idea that society functions as a complete, organized and homogeneous living being. Adapted to the community they wish to constitute or reconstitute (whether based on ethnicity, nationality, religion or race), the concept leads them to reject every form of universalism in favor of autophilia and alterophobia, or in other words the idealization of a "we" excluding a "they". The far right tends to absolutize differences between nations, races, individuals or cultures since they disrupt their efforts towards the utopian dream of the "closed" and naturally organized society, perceived as the condition to ensure the rebirth of a community finally reconnected to its quasi-eternal nature and re-established on firm metaphysical foundations.

As they view their community in a state of decay facilitated by the ruling elites, far-right members portray themselves as a natural, sane and alternative elite, with the redemptive mission of saving society from its promised doom. They reject both their national political system and the global geopolitical order (including their institutions and values, e.g. political liberalism and egalitarian humanism) which are presented as needing to be abandoned or purged of their impurities, so that the "redemptive community" can eventually leave the current phase of liminal crisis to usher in the new era. The community itself is idealized through great archetypal figures (the Golden Age, the savior, decadence and global conspiracy theories) as they glorify non-rationalistic and non-materialistic values such as the youth or the cult of the dead.

Political scientist Cas Mudde argues that the far right can be viewed as a combination of four broadly defined concepts, namely exclusivism (e.g. racism, xenophobia, ethnocentrism, ethnopluralism, chauvinism, including welfare chauvinism), anti-democratic and non-individualist traits (e.g. cult of personality, hierarchism, monism, populism, anti-particracy, an organicist view of the state), a traditionalist value system lamenting the disappearance of historic frames of reference (e.g. law and order, the family, the ethnic, linguistic and religious community and nation as well as the natural environment) and a socioeconomic program associating corporatism, state control of certain sectors, agrarianism, and a varying degree of belief in the free play of socially Darwinistic market forces. Mudde then proposes a subdivision of the far-right nebula into moderate and radical leanings, according to their degree of exclusionism and essentialism.

The Encyclopedia of Politics: The Left and the Right states that far-right politics include "persons or groups who hold extreme nationalist, xenophobic, homophobic, racist, religious fundamentalist, or other reactionary views." While the term far right is typically applied to fascists and neo-Nazis, it has also been used to refer to those to the right of mainstream right-wing politics.