The impetus for this chapter is the extraordinary difficulties surrounding the adoption of the Lisbon Treaty. It aims to provide a framework within which to explore trust in EU law. The question of trust has become even more significant since the adoption of the Lisbon Treaty with the
emergence of the fiscal crisis in Greece and in the wider eurozone. This chapter initially seeks to locate the question of trust within the much-discussed notion of the democratic deficit in the EU, drawing on the work of Snell. It argues that the question of democratic deficit raises questions
about trust in the EU, and that institutionalised distrust is what is required in order to secure appropriate trust in EU law and governance. It then examines the nature of trust before turning to two major crises of distrust in the EU: the Irish referenda on the Lisbon Treaty and the ongoing
difficulties presented to the eurozone of the indebtedness of some of its members.