This book constitutes the proceedings of the Workshops held in conjunction with SAFECOMP 2020, 39th International Conference on Computer Safety, Reliability and Security, Lisbon, Portugal, September 2020.The 26 regular papers included in this volume were carefully reviewed and selected from 45 submissions; the book also contains one invited paper. The workshops included in this volume are:DECSoS 2020:15th Workshop on Dependable Smart Embedded and Cyber-Physical Systems and Systems-of-Systems.DepDevOps 2020:First International Workshop on Dependable Development-Operation Continuum Methods for Dependable Cyber-Physical Systems.USDAI 2020:First International Workshop on Underpinnings for Safe Distributed AI.WAISE 2020:Third International Workshop on Artificial Intelligence Safety Engineering.The workshops were held virtually due to the COVID-19 pandemic.