This book constitutes the thoroughly refereed conference proceedings of the 6th International Conference on Networked Systems, NETYS 2018, held in Essaouira, Morocco, in May 2018. The 22 full and 6 short papers presented together with 11 keynotes and 2 invited papers were carefully reviewed and selected from 85 submissions. They are organized in the following topics: distribution; concurrency; verification; networking; self-stabilization; security; graph; and middleware.