THERE are significant research challenges involving the development of protocols, platform, and applications of WBANs,especiallywhenwirelessbodysensorsareeitherwearable or implanted into the human body and thus their resources and capacities are extremely limited. Many existing sensor network solutions are not applicable to WBANs. There are numerous research issues in WBANs related to interoperability, communicationinterference,security,mobility,energy,deployment, and costs, etc. New emphasis on the applications such as smarthealthandwell-beingwillsignificantlyspeedupthewide deployment of WBANs and broaden their impact. Therefore, significant research efforts are expected in the area of WBANs to push forward this key wireless health technology. It is the great honor of the editorial team to have nine research groups to share their latest research works and solutions to these challenges. The special issue (SI) attracted 29 submissions from North America, Europe, Australia, and Asia. Our Guest Editor (GE) team accepted nine papers that cover multiple aspects of emerging WBANs for ubiquitous healthcare. We hope that this SI will serve as good references for engineers, scientists, researchers, and academics in the field of WBANs