This book constitutes the refereed proceedings of the 18th International Conference on Persuasive Technology, PERSUASIVE 2023, held in Eindhoven, The Netherlands, April 19-21, 2023. The 24 full papers and 2 short papers included in this book were carefully reviewed and selected from 69 submissions. They were organized in topical sections as follows: Persuasive Technologies in Virtual and Augmented Reality; Persuasive Strategies; Persuasive Design and Applications; Methods for Tailoring and Personalisation; Artificial Persuasive Agents; Gamification; and Personal Factors in Persuasion.