This book constitutes the proceedings of the 23rd European Symposium on Programming, ESOP 2014, which took place in Grenoble, France, in April 2014, as part of the European Joint Conferences on Theory and Practice of Software, ETAPS 2014. The 27 papers presented in this volume were carefully reviewed and selected from 109 submissions. In addition, the book contains two invited talks. The contributions are organized in topical sections named: type systems; verified compilation; program verification; semantics; concurrency; linear types; network and process calculi; and program analysis.