This book constitutes the refereed conference proceedings of the 18th International Workshop on Design and Architecture for Signal and Image Processing, DASIP 2025, held in Barcelona, Spain, during January 20-22, 2025. The 10 full papers included in this book were carefully reviewed and selected from 23 submissions.They were organized in topical sections as follows: Specialized Hardware Architecture for Efficient Processing; Efficient Processing using AI for Image, Vision and Signal Applications, and Analysis of Emerging Techniques for Signal Processing Applications.