This book constitutes the refereed proceedings of the 7th International Conference on Formal Engineering Methods, ICFEM 2005, held in Manchester, UK in November 2005. The 30 revised full papers presented together with 3 invited contributions were carefully reviewed and selected from 74 submissions. The papers address all current issues in formal methods and their applications in software engineering. They are organized in topical sections on specification, modelling, security, communication, development, testing, verification, and tools.