Multi-hop wireless networks have attracted the attention of the research community in the last several years, mostly because of the growing interest in a connected world, where people are - virtually - omnipresent. Next generation wireless networks, heterogeneous access technologies, ad-hoc and sensor networks, and new Internet technologies are part of this pervasive environment. MED-HOC-NET 2013, as its previous 11 predecessors focuses on communication networking research, especially on new issues in Wireless Mesh and Ad-Hoc Networks, which include Civil Security and Safety, Optimization and Control Schemes, Operation under Intermittent Connectivity, Green mechanisms, Location, Application Scenarios. The scope of the workshop also includes new and exciting challenges in wireless mesh networks, sensor networks, vehicular networks, delay tolerant and opportunistic networks, and the opportunities provided from new paradigms. As a major annual international workshop, the 12th MED-HOC-NET conference aims to serve as a platform for researchers and visionaries from the academia, the research laboratories, and the industry to present their latest work. Following recent successful conferences in Sicily (2006), Corfu (2007), Palma de Mallorca (2008), Haifa (2009), Juan-les-pins (2010), Favignana Island (2011) and Cyprus (2012), Med-Hoc-Net 2013 will take place in Corsica.