This book constitutes the thoroughly refereed post-proceedings of the 7th International Conference on Principles of Distributed Systems, OPODIS 2003, held at La Martinique, French West Indies in December 2003.

The 19 revised full papers presented together with abstracts of 3 invited talks were carefully selected from 61 submisions during two rounds of reviewing and improvement. The papers are organized in topical sections on distributed and muliprocessor algorithms; peer-to peer systems and middleware; real-time and embedded systems; and verification, modeling, and performance of distributed systems.