There is a pressing need to design and evaluate both cyber- and physical systems (CPS) together and holistically for a rapidly growing number of applications, such as emerging and future combat systems, ground-aerial-water vehicles, as well as smart buildings, bridges and other structures. In such systems, cyber components are embedded in – and work for/with – physical systems. However, the two are designed and implemented separately, without considering their interplay, thus requiring expensive and time-consuming tweaking of both components. Recognizing this issue, the National Science Foundation (NSF) has been orchestrating multiple research communities to identify basic research issues in CPS and formulate a research portfolio. This ARO-sponsored workshop intends to focus on security and privacy in CPS. It will bring together a group of experts in order to identify key CPS security and privacy research issues and recommend the Army Research Office (ARO) to invest its resources to address them.