This book constitutes the proceedings of the 17th International Symposium on Functional and Logic Programming, FLOPS 2024, held in Kumamoto, Japan, in May 2024. The 15 papers presented in this volume were carefully reviewed and selected from 28 submissions. The scope includes all aspects of the design, semantics, theory, applications, implementations, and teaching of declarative programming. FLOPS speci cally aims to promote cross-fertilization between theory and practice and among di erent styles of declarative programming.