This book constitutes the proceedings of the 28th International Conference on Formal Methods for Industrial Critical Systems, FMICS 2023, held in Antwerp, Belgium, during September 20–22, 2023.The 14 full papers included in this book were carefully reviewed and selected from 24 submissions. The papers focus on development and application of formal methods in industry. FMICS is a platform for scientists and engineers who are active in the area of formal methods and interested in exchanging their experiences in the industrial usage of these methods. FMICS also strives to promote research and development for the improvement of formal methods and tools for industrial applications.