Logic and argumentation : 5th International Conference CLAR 2023 Hangzhou China September 10 12 2023 proceedings This book constitutes the refereed proceedings of the 5th International Conference on Logic and Argumentation CLAR 2023 held in Hangzhou China during September 10 12 2023. The 11 full papers one short paper and one invited paper presented in this book were carefully reviewed and selected from 20 submissions. The papers focus on topics such as: logic and automated deduction; abstract and structured argumentation; dialogues games and practical reasoning; and quantitative argumentation