The Arab Spring initiated a new era in the history of the Middle East and significantly shifted regional dynamics. It profoundly marked the history of the region and affected relations between Middle Eastern countries. Qatar–Saudi Arabia relations have likewise been profoundly impacted by it. This study focuses on how the Arab Spring affected relations between Qatar and Saudi Arabia, and on how the regional power struggle and rivalry between Riyadh and Doha were exacerbated during that period when disagreements and clashes escalated and deepened between both countries. It also emphasizes the causes of tensions that emerged during the period of the Arab Spring between both states. Using classical realism as a theoretical framework in approaching the issues at hand, the study begins by outlining the historical background to Qatar–Saudi Arabia relations. It then describes the policies of Qatar and Saudi Arabia towards the Arab Spring and explores the problem areas in their bilateral relations. Finally, the sanctions imposed against Qatar are also discussed.