Electronics and Telecommunications are two fundamental and rapidly evolving technologies, which constitute basic pillars of scientific and economic development. Given their important role and contribution from a technical, but even social, perspective, the 4th Panhellenic Conference on Electronics and Telecommunications-PACET, which is hosted by the Department of Electrical and Computer Engineering of the Democritus University of Thrace in Kimmeria Campus in Xanthi, on 17th, 18th and 19th November 2017, aims at reporting progress and recent advances in all aspects of electronics and communications both at academic and industrial level.