This book constitutes the proceedings of the 15th International Workshop on Security and Trust Management, STM 2019, held in Luxembourg City, Luxembourg, in September 2019, and co-located with the 24th European Symposium Research in Computer Security, ESORICS 2019. The 9 full papers and 1 short paper were carefully reviewed and selected from 23 submissions.

The papers present novel research on all theoretical and practical aspects of security and trust in ICTs.