The understanding of scientism, developed in the modern period accepted scientific discourses as the only valid form of knowledge in society and excluded alternative views. This inspired totalitarian systems. Paul Feyerabend challenged the “tyranny of science” and proposed a pluralist approach to science in order to realize the ideal of a free and democratic society. Developing the theories of “Epistemological Anarchism” and “Scientific Pluralism,” he argued that knowledge could not be limited to a single method and put forward the concept of “Democratic Relativism” as an extension of these views. Feyerabend’s pluralist ideas resonated not only in the scientific sphere but also in political philosophy and were reflected in Will Kymlicka’s A Liberal Theory of Minority Rights. Kymlicka argued for a society that recognizes and supports cultural and ethnic diversity, arguing that individual, group and national rights must be protected. This article, Feyerabend’s scientific pluralism with Kymlicka’s political multiculturalism and evaluates their solutions to the tension between diversity and unity in modern societies. For this purpose, the article seeks answers to vital questions such as how both philosophers aim to keep differences together in their imagination of a multicultural society based on equality, how they plan to resolve possible conflicts, and how social unity can be achieved.