This book constitutes the thoroughly refereed conference proceedings of the 18th International Workshop on Formal Methods for Industrial Critical Systems, FMICS 2013, held in Madrid, Spain, in September 2013. The 13 papers presented were carefully selected from 25 submissions and cover topics such as design, specification, code generation and testing based on formal methods, methods, techniques and tools to support automated analysis, certification, debugging, learning, optimization and transformation of complex, distributed, dependable, real-time systems and embedded systems, verification and validation methods, tools for the development of formal design descriptions, case studies and experience reports on industrial applications of formal methods, impact of the adoption of formal methods on the development process and associated costs, application of formal methods in standardization and industrial forums.