This chapter examines debates about multiculturalism in political theory. In the 1990s, some argued that it was impossible not to be in favour of multiculturalism. However, recent events, such as the bomb attack at Burgas airport in Bulgaria and the shootings by a lone gunman in France (both occurred in 2012), have led some to fear that supporting cultural diversity undermines a strong national identity. These critics have called vigorously for assimilation, as opposed to multicultural thinkers who prefer the notion of integration. This chapter considers themes such as thick and thin multiculturalism, cultural rights, multiculturalism and oppression, and the politics of recognition. A case study on the Muslim veil is presented, along with Key Thinkers boxes featuring Yael Tamir, Will Kymlicka, Charles Taylor, and Bhikhu Parekh.