In this paper, it is argued that even though the concept of community does not play a significant role in Marxist theory, Marxism needs a notion of community, and the paper sets out to theorize how to make sense of this concept in a Marxist theoretical setting. The paper claims that Althusser’s philosophy, especially his elaboration of the concept of practice, may assist us in this task, and it sets out to explore what can be gained by redefining community in terms of practice. In Althusser’s theory, practice and ideology are very closely linked. While recognizing the importance of Althusser’s theory of ideology, the paper then subsequently explores an alternative configuration of the concepts community and ideology. Finally, it is claimed that this analysis may help us to better understand ideologies such as racism and nationalism.