The International Symposium on networks-on-chip (NOCS) serves as the premier interdisciplinary meeting for research on NoC architecture, implementation, analysis, optimization, and verification, encompassing various aspects of NoCs for embedded high-performance computing systems, un-core and system-level NoCs, inter/intrachip, and rack-scale networks. Similar to previous years, this event has been held in conjunction with the Embedded Systems Week (ESWEEK). This year, NOCS was held in Hamburg, Germany, on 21-22 September 2023, marking its return to a fully in-person conference after virtual and hybrid editions during the pandemic.