How education systems operate in divided societies is an increasingly important question for academics and educational practitioners as well as for governments. The question is particularly pertinent in post-conflict societies, where education is a key mechanism for resolving conflict between divided communities. Using Northern Ireland as a case study, this article sheds new light on the role of education in conflict resolution by examining the long-term impact of segregated and integrated education on attitudes towards community relations and levels of contact between the Protestant and Catholic communities. The results suggest that individuals who had attended an integrated school are significantly more likely to have friends and neighbours from across the religious divide and that these friendship networks translate into a more optimistic view of future community relations. This is not the case, however, when kinship networks are considered. The evidence from Northern Ireland suggests that the education system can be a source of both conflict and cohesion depending on the nature of the school system as well as the particular source of division to be addressed. (Contains 5 tables.)