From 10th to 11th April 2019, the 3rd Conference on “Cyber Security in Maritime Domain” was held at NMIOTC, attended by 147 participants from 24 Allied and Partner nations, International Organizations, the international academic community, representatives from the marine and communication industry and several strategic think tanks. The aim was to build synergies between public and private sector in general, individual researchers, navy staffs, members of associations, academia, shipping companies, standardization bodies, international organizations and governmental agencies regarding Cyber Security in the maritime domain and Cyber Defence operations. NMIOTC envisaged tackling Cyber Security issues in the maritime domain in a holistic, comprehensive and effective way.