This book constitutes the refereed proceedings of the 14th International Conference on Software Architecture, ECSA 2020, held in A’quila, Italy, in September 2020.In the Research Track, 12 full papers presented together with 5 short papers were carefully reviewed and selected from 103 submissions. They are organized in topical sections as follows: microservices; uncertainty, self-adaptive, and open systems; model-based approaches; performance and security engineering; architectural...