This book constitutes the thoroughly refereed post-conference proceedings of the 9th International Symposium on Trustworthy Global Computing, TGC 2014, held in Rome, Italy, in September 2014. The 15 revised full papers presented were carefully reviewed and selected from 20 submissions. The Symposium on Trustworthy Global Computing focuses on frameworks, tools, algorithms, and prools for open-ended, large-scale systems and applications, and on rigorous reasoning about their behavior and properties.