It has long been established that an effective citizenship education in a multicultural society must incorporate some exposure to a variety of views on different topics. However, the ability and willingness to deal with difference relating to controversial matters of national identity, narrative and conflict vary. This is not least the case in the ethno-nationally divided and conflict-affected jurisdictions of Northern Ireland and Israel. This article relates qualitative research conducted among students, teachers and policy-makers in these two jurisdictions that explores the area of dealing with difference within citizenship education. Using the starting point of a framework based on international law on education, the article goes on to consider how freedom of expression and non-discrimination are variously interpreted and balanced when exploring controversial issues in the classroom of a divided society.