The Black Sea Maritime Security Symposium-2021 was successfully held by the NATO Maritime Security Centre of Excellence in a hybrid format (in-person and virtually) on 26 - 27 October 2021, and a total number of 75 attendees from 15 different countries (Albania, Azerbaijan, Bulgaria, Georgia, Germany, Greece, Italy, Kuwait, Morocco, Romania, Spain, Türkiye, Ukraine, UK and USA) participated in the event. The symposium gathered up different stakeholders from military, governmental organizations, and academia by providing an opportunity to discuss maritime security issues within the Black Sea.