This article discusses the Union’s general inspirational idea of creating a ‘common sense of justice’ and its implications with reference to the development of the European Public Prosecutor. When the Commission presented its vision of an area of justice, it declared that the ‘ambition is to give citizens a common sense of justice throughout the Union’. Although a sense of justice seems to be something psychological and emotional, it also seems almost inevitably to promote EU integration. The article discusses the various roles that the EPPO may have in contributing to a common sense of justice and in particular the EPPO’s objective of achieving a Union-wide coherent practice on prosecution and penalty levels. It analyses critically whether this practice – by mediating between the different ‘common’ senses of justice in each Member State – is capable of contributing to a common sense of justice.