Employing the trend analysis method and relying on qualitative research, the study explores the historical developments, behavioral patterns, and driving factors that have shaped the interactions between these two actors. The findings indicate that a shared perception of threat—particularly from Iran, resistance movements, and the rise of Sunni political Islam in the region—has gradually facilitated a cautious rapprochement between Saudi Arabia and the Zionist regime. This convergence has been manifested in intelligence cooperation, covert diplomatic coordination, and shared stances on regional issues such as the Iranian nuclear agreement (JCPOA), along with secret economic and technological collaborations. However, internal constraints (such as public opinion sensitivities in Saudi Arabia and the rise of far-right groups within the Zionist regime), external limitations (notably the Palestinian issue), as well as political frictions and mutual distrust, have hindered the full normalization of relations. The article argues that, within a tacit security regime—contrary to liberal functionalist perspectives—convergence begins with security-oriented concerns and subsequently extends to other issue areas. Accordingly, the relations between these two actors have developed not through formal treaties but rather on the basis of mutual interests and geopolitical necessities, and due to existing constraints, have not yet evolved into a formalized arrangement.