This book constitutes the proceedings of the 18th Mexican Conference on Pattern Recognition, MCPR 2026, held in Ciudad Juárez , Mexico, during June 24&27, 2026. The 34 full papers presented in this volume were carefully reviewed and selected from 58 submissions. The papers are organized into the following topical sections: Pattern Recognition and Machine Learning Techniques; Deep Learning and Neural Networks; Computer Vision; Language Processing and Recognition; and Medical Applications of Pattern Recognition.