Operations at sea and in ports provide a number of highly unique challenges for those companies and organisations engaged in them. Finding and creating ways to perform tasks in remote locations, provide long distance communications, and track large quantities of goods is imperative to success. The maritime sector relies on a wide range of systems and technologies to underpin this, where cyber-security is imperative for their trusted operation. This workshop seeks to bring together expert research in the field of maritime cyber-security and applicable technologies to discuss the state of the art, existing and forthcoming challenges and novel techniques for maritime security.