This book constitutes the refereed proceedings of the 31st International Static Analysis Symposium, SAS 2024, held in Pasadena, CA, USA, in October 2024.  Static analysis is widely recognized as a fundamental tool for program verification, bug detection, compiler optimization, program understanding, and software maintenance. The papers presented in this book deal with theoretical, practical and application advances in this area. The 18 papers included here were carefully reviewed and selected from 45 submissions.