The 12th International Conference on Applications of Graph Theory in Wireless Ad Hoc Networks and Sensor Networks (Graph-Hoc 2020) will take place on September 26-27, 2020, in Copenhagen, Denmark, focusing on the application of graph theory to various areas of ad hoc networks. Researchers are invited to submit original papers by July 4, 2020, covering theoretical and practical advancements in areas such as routing, connectivity, and resource allocation. Selected papers will be published in specialized journals after further revisions.