This book constitutes the proceedings of the 14th International Workshop on Security and Trust Management, STM 2018, held in Barcelona, Spain, in September 2018, and co-located with the 23rd European Symposium Research in Computer Security, ESORICS 2018. The 8 full papers were carefully reviewed and selected from 28 submissions. The focus of the workshop was on the following topics: cryptosystems and applied cryptography; modeling and risk assessment; and trust computing.