Maritime Security Conference-2021 was successfully held on 9 - 10 June 2021 with the main theme of "Contemporary Risks, Threats, and Maritime Unmanned Systems (MUS) in Global Maritime Security", and a total number of 132 attendees from 24 different countries participated to the both in-person and virtual (hybrid) event. The conference gathered up different stakeholders from military / govermental organizations and academia by providing an opportunity to discuss this timely and relevant topic with a wide spectrum of sub-topics.