The 7th Workshop on Coding and Systems will take place in Salamanca in July 1-3, 2015. The workshop is devoted to general coding theory, with a particular focus on convolutional codes, and its interplay with systems theory. The workshop will have a particular focus on the research progress of the working groups 1 and 4 of the European COST action COST IC1104 on network coding: http://www.network-coding.eu/ As in previous workshops there will be no registration fee and each participant is expected to cover her/his own travel and accomodation expenses. Members of the COST action can inquire about the covering of travel expenses by the COST grant. We kindly request all participants to inform us in advance about their intention to attend. Everyone is invited to present an oral communication. Those who are willing to give a talk should send a title and an abstract no later than May 22.