*The Third International Workshop on Security, Privacy, and Trustworthiness in Medical Cyber-Physical Systems <http://sceweb.sce.uhcl.edu/sha/medspt2018.html>**(MedSPT 2018)* *in conjunction with IEEE/ACM CHASE 2018* *Outstanding papers will be invited to extend to full version for Journal of Medical Systems (Impact Factor 2.456).* Washington, DC, USA September 26-28, 2018 Deadline June 8, 2018 Medical Cyber-Physical Systems (MCPS) are life-critical, context-aware, and networked systems of medical devices that provide tight integration and coordination between the cyber world of computing and communications and the physical world. Recent advances in mobile and wearable healthcare, communication, and Cloud computing technologies are making MCPS a promising platform for scientific advancement and development of new tools that may improve patients' health and wellbeing. Coming along with the potential social economic and personal healthcare benefits are significant security, privacy, and trustworthiness challenges in MCPS, due to unreliable embedded software controlling medical devices, weak computing and networking capabilities of medical devices, and adaptive privacy requirements introduced by complicated physiological dynamics of patient bodies. So far, the security, privacy, and trustworthiness initiatives for MCPS are still at an early stage. On one hand, more and more concerns have been raised in the fields and many security, privacy, and trustworthiness-enhancing techniques have been proposed to resolve these concerns. On the other hand, the emerging mobile and wearable technologies revolutionize the entire MCPS as well as its models of security, privacy, and trustworthiness. It is still not clear that these proposed techniques are useful and effective in practice and how quickly or even possibly they are going to be adopted. This workshop aims to bring together the technologists and researchers who share interests in the area of security, privacy, and trustworthiness in medical cyber-physical systems, as well as explore new avenues of collaboration. The main purpose is to promote discussions of research and relevant activities in the design of secure, privacy, or trustworthiness architectures, protocols, algorithms, services, and applications on medical cyber-physical systems. It also aims at increasing the synergy between academic and industry professionals working in this area. We plan to seek papers that address theoretical, experimental research, and work-in-progress for security, privacy, and trustworthiness related issues in the context of medical cyber-physical system.