A culture war is a form of cultural conflict (metaphorical war) between different social groups who struggle to politically impose their own ideology upon mainstream society, or upon the other. In political usage, culture war is a metaphor for "hot-button" politics about values and ideologies, realized with intentionally adversarial social narratives meant to provoke political polarization among the mainstream of society over economic matters, such as those of public policy, as well as of consumption. As practical politics, a culture war is about social policy wedge issues that are based on abstract arguments about values, morality, and lifestyle meant to provoke political cleavage in a multicultural society.

The Kulturkampf (German pronunciation: [kʊlˈtuːɐ̯ˌkamp͡f]; lit. 'Cultural Struggle') was the seven-year political conflict (1871–1878) between the Catholic Church in Germany led by Pope Pius IX and the Kingdom of Prussia, led by Chancellor Otto von Bismarck, as well as other German states. The Prussian church-and-state political conflict was about the church's direct control over both education and ecclesiastical appointments in the Prussian kingdom. Moreover, when compared to other church-and-state conflicts about political culture, the Kulturkampf of Prussia also featured anti-Polish sentiment.

In the English language, the term culture war is a calque of the German word Kulturkampf (culture struggle), which refers to a historical event in Germany. The term appears as the title of an 1875 British book review of a German pamphlet.

Since the time that James Davison Hunter first applied the concept of culture wars to American life, the idea has been subject to questions about whether "culture wars" names a real phenomenon, and if so, whether the phenomenon it describes is a cause of, or merely a result of, membership in groups like political parties and religions. Culture wars have also been subject to the criticism of being artificial, imposed, or asymmetric conflicts, rather than a result of authentic differences between cultures. Researchers have differed about the scientific validity of the notion of culture war. Some claim it does not describe real behavior, or that it describes only the behavior of a small political elite. Others claim culture war is real and widespread, and even that it is fundamental to explaining Americans' political behavior and beliefs. A 2023 study on the circulation of conspiracy theories on social media noted that disinformation actors insert polarizing claims in culture wars by taking one side or the other, thus making the adherents circulate and parrot disinformation as a rhetorical ammunition against their perceived opponents.

Political scientist Alan Wolfe participated in a series of scholarly debates in the 1990s and 2000s against Hunter, claiming that Hunter's concept of culture wars did not accurately describe the opinions or behavior of Americans, which Wolfe claimed were more united than polarized. A meta-analysis of opinion data from 1992 to 2012 published in the American Political Science Review concluded that, in contrast to a common belief that political party and religious membership shape opinion on culture war topics, instead opinions on culture war topics lead people to revise their political party and religious orientations. The researchers view culture war attitudes as "foundational elements in the political and religious belief systems of ordinary citizens."

Some writers and scholars have said that culture wars are created or perpetuated by political special interest groups, by reactionary social movements, by party dynamics, or by electoral politics as a whole. These authors view culture war not as an unavoidable result of widespread cultural differences, but as a technique used to create in-groups and out-groups for a political purpose. Political commentator E. J. Dionne has written that culture war is an electoral technique to exploit differences and grievances, remarking that the real cultural division is "between those who want to have a culture war and those who don't."

Sociologist Scott Melzer says that culture wars are created by conservative, reactive organizations and movements. Members of these movements possess a "sense of victimization at the hands of a liberal culture run amok. In their eyes, immigrants, gays, women, the poor, and other groups are (undeservedly) granted special rights and privileges." Melzer writes about the example of the National Rifle Association of America, which he says intentionally created a culture war in order to unite conservative groups, particularly groups of white men, against a common perceived threat. Similarly, religion scholar Susan B. Ridgely has written that culture wars were made possible by Focus on the Family. This organization produced conservative Christian "alternative news" that began to bifurcate American media consumption, promoting a particular "traditional family" archetype to one part of the population, particularly conservative religious women. Ridgely says that this tradition was depicted as under liberal attack, seeming to necessitate a culture war to defend the tradition.

Political scientists Matt Grossmann and David A. Hopkins have written about an asymmetry between the US's two major political parties, saying the Republican party should be understood as an ideological movement built to wage political conflict, and the Democratic party as a coalition of social groups with less ability to impose ideological discipline on members. This encourages Republicans to perpetuate and to draw new issues into culture wars, because Republicans are well equipped to fight such wars. According to The Guardian, "many on the left have argued that such [culture war] battles [a]re 'distractions' from the real fight over class and economic issues."