Social media has become an essential part of Omani society. Omanis are spending more and more time on social media than ever before. The new characteristics and features of social media have attracted many people and users due to its availability, ease access to information and quick tool for establishing relationships. People feel more secure and free to express their opinions online via social media. However, social media has continued to be misused and exploited by many states and non-states actors such as terrorists, criminals and cyber activists. Recently, social media platforms have been used to call for protests, commit crime, spread rumors and hate. Most importantly, social media has become a serious challenge to Omani National Security. In 2011, Sultanate of Oman, as other GCC countries, has witnessed some social movements and unrests. Social media played a major role in mobilizing these movements and spreading it out in the country. In addition, the number of cybercrimes has increased remarkably due to the spread of online websites and applications. The purpose of this research is to identify and explore the social media impact on Omani national security. The present study uses a Qualitative Approach. To achieve this purpose, this research mainly depended on conducting interviews, as primary sources to gain data. Some Information Technology Specialists were interviewed along with the cybercrimes analysts from Royal Oman Police to express their opinions and enrich the research. Published data such as books, magazines, journals, events and seminars were used as secondary sources. This research revealed that social media has challenged Oman National Security greatly. Social media outlets have led to the increase number of cybercrimes, criminal activities, frauds and blackmails and spread of rumors. However, the Omani government has followed some strategies to compete these challenges, but social media threats still continue. This research concluded with some recommendations for both policy makers and social media users.