This book constitutes the refereed proceedings of the 9th International Conference on Security Standardisation Research, SSR 2024, held in Kunming, China, during December 16, 2024. The 7 full papers included in this book were carefully reviewed and selected from 19 submissions. These papers focus on a wide range of topics within the field of Security standardization research. This book also includes the full paper from the invited keynote talk titled "Standardisation of and Migration to Post-Quantum Cryptography", given by Liqun Chen. .