This book constitutes the refereed proceedings of the 17th International Conference on Logic Programming and Nonmonotonic Reasoning, LPNMR 2024, held in Dallas, TX, USA, during October 11-14, 2024. The 27 full papers and 3 short papers included in this book were carefully reviewed and selected from 48 submissions. They deal with declarative logic programming, non-monotonic reasoning, and knowledge representation, focusing on the design and implementation of logic-based programming languages and database systems. .