The IEEE International Workshop on Architectures for Future Mobile Computing and Internet of Things (FMCIoT 2019) will be held in conjunction with the 12th IEEE International Conference on Internet of Things (iThings-2019). The FMCIoT 2019 Workshop aims at soliciting original ideas on the broad area of Mobile and IoT architectures including challenges and opportunities, concepts, applications, and future trends that addresses the aforementioned challenges. The Workshop aims to facilitate discussions among academics and industry to bridge Mobile Computing and IoT practitioners and make positive contributions to the field.