This book constitutes the refereed proceedings of the 11th International Workshop on Software Engineering for Resilient Systems, SERENE 2019, held in Naples, Italy, in September 2019.The 5 full papers and 4 short papers presented together with 1 keynote and 1 invited paper were carefully reviewed and selected from 12 submissions. They cover the following areas: resilience engineering in complex and critical applications; testing and validation methods; security, trust and privacy management.