The International Conference on Embedded Wireless Systems and Networks (EWSN) is a highly selective single-track international conference focusing on the innovative research related to embedded systems and wireless networking. After a stint outside of Europe, EWSN returns, being held in Lyon, France for the 2020 edition. As in previous years, EWSN continues to welcome contributions on all areas related to embedded wireless systems and networks, from communication and networking, to sensing, actuation, and control, to applications and human-machine interaction. As the relevant environments grow increasingly diverse and dense, we encourage contributions addressing this increased heterogeneity, ultra dense networks, and novel applications to developing countries and emerging markets. As always, contributions are welcome across the entire scope of the conference.