Amidst a growing interest from European Union (EU) Member States, the European Commission recently announced that it would put forward a legislative proposal for the adoption of a harmonised and mandatory front-of-pack nutrition labelling scheme at the EU level. The present contribution discusses the implications of such an adoption, taking a behavioural, legal and policy angle. It introduces first the concept of front-of-pack nutrition labelling and the existing evidence regarding its effects on consumer behaviour and dietary habits. It then presents the legal framework currently applicable to (front-of-pack) nutrition labelling in the EU and discusses some of the main political and practical aspects involved with the development of a common EU front-of-pack label.