Proceedings of the Cybersecurity in Cyber-Physical Workshop,April 23 – 24, 2012, complete with abstracts and slides from presenters. Some of the cyber-physical systems covered during the first day of the workshop included networked automotive vehicles, networked medical devices, semi-conductor manufacturing, and cyber-physical testbeds. Day two of the workshop covered the electric smart grid. Dr. Farnham Jahanian, NSF, was the keynote speaker on day one.