RTEST 2015 is an annual symposium targeted at bringing researchers in the fields of real-time systems, embedded systems, and related technologies, from both industry and academia together. This year the event is planned to be held on 7-8 October 2015 at Sharif University of Technology, Tehran, Iran. This event covers five main areas, including: real-time software and applications and related tools, embedded hardware, real-time and embedded networks, real-time and embedded operating systems, and system-level design.