The Master's thesis "Competencies of Officers in the Military Defense of the Cyber Space" explores the key competencies required by military officers in addressing the challenges of cybersecurity and protection of information systems. In today's increasingly digitized world, cybersecurity has become a critical aspect of military operations and national security. The aim of this thesis is to identify the competencies of officers at different ranks (OF-1 to OF-6) to ensure their successful performance in the military defense of the cyber space. The research findings highlight the importance of understanding competencies at various ranks to identify the necessary skills and knowledge for effectively carrying out tasks in the military defense of the cyber space. Continuous improvement and adaptation of competencies, taking into account rapid technological changes and advancements in cyber threats, are crucial for ensuring effective defense and protection of information systems. Through this Master's thesis, we gain a deeper understanding of the competencies of officers in the military defense of the cyber space and emphasize their significance in ensuring cybersecurity and national defense. Overall, this research provides a foundation for further development and guidance in the training of military officers in the field of cybersecurity, aiming to establish a strong and efficient defense of our digital infrastructure.