Globalisation and increased mobility of people within the EU have led to increased immigration and greater diversity within many EU countries, which has affected the composition of workplaces and classrooms. This includes diversity in terms of nationality, as well as ethnic, racial and religious diversity. This article expands awareness of diversity issues in the workplace to classrooms. It is based on a cross-cultural comparative study of the attitudes of secondary school students and their teachers in six European countries: Ireland, the UK, France, Latvia, Italy and Spain. The sample included 320 students and 208 teachers for a total of 528 respondents. The article compares and contrasts attitudes towards nonnational students, ethnic and religious minorities and disabled students, as well as gender issues, bullying and general perceptions of equality and diversity. It demonstrates that there is a need for teachers to have the skills and competencies to deal effectively with this new environment. The study contributes to teacher training development and discusses how to create a more inclusive classroom.