The International Conference on Embedded Wireless Systems and Networks (EWSN) is a highly selective single-track international conference focusing on premier research results at the intersection of embedded systems and wireless networking – an area of highest relevance for visionary technologies such as the Internet of Things or Cyber-Physical Systems and application domains such as Smart Production, Smart Cities, or Connected Cars. The featured topic of the 2018 edition of EWSN is “Sustainable Embedded Wireless Systems”, with contributions that aim to contain the energy cost and the carbon footprint of embedded wireless systems. Topics such as energy-efficient wireless networking technologies and architectures, backscatter communication, adaptation of embedded systems supplied by variable renewable energy sources, wireless power transfer as well as application of embedded wireless systems to increase the energy efficiency of smart homes, smart buildings, and smart cities are welcome. Topics not related to “Sustainable Embedded Wireless Systems” are equally welcome as long as they fall into the scope of the conference. This year, the "Best Paper Award" is sponsored by the IEEE Computer Society Technical Committee on Simulation (TCSIM). EWSN 2018 will also host the MadCom and RED-IOT workshops, and feature a sustainability competition, a poster and demo session, and one industrial panel of renowned experts on "Testbeds and trials for 5G deployments".