The Third Edition of the International Workshop on Executable Modeling (EXE) was held on September 18, 2017 in Austin, Texas, as part of the satellite events of the ACM/IEEE 20th International Conference on Model Driven Engineering Languages and Systems (MODELS 2017). It brought together over 40 researchers and practitioners to discuss recent advances and current challenges in executable modeling. The workshop program comprised a keynote on open-source MDE tooling for the Internet of Things by Juergen Dingel from Queen's University, presentations of five research papers, one tool demonstration, as well as a panel discussion on executable modeling for hardware, software, and cyber-physical systems.