Education policies of the European Commission and the Council of Europe stress the importance of cultural and language diversity. A white book by the European Commission on education and training recommends that every European citizen be able to communicate in at least 3 of the 12 officially recognized languages of the European Union by the end of high school. Simultaneously, there has been a major move toward using English within the 15 member states of the European Union. Against this backdrop, mother tongue teaching and learning as well as foreign language teaching/studying/learning are confronted with many new situations. Teacher education must provide the ability for prospective teachers to acquire the professional competence necessary to deal proactively with this phenomenon. This paper uses Finland and Sweden as examples of developments within the European Union, presenting various solutions in teacher education which have been adopted in these Nordic countries. Solutions include teaching more foreign languages and teaching them earlier; providing immersion programs; providing bilingual education; and teaching old minority languages as new school subjects. The paper examines the cognitive benefits of multilingualism and discusses trends in language teaching and learning in Nordic countries. (Contains 43 references.) (SM)