--- - |2 This study's main objective was to explore whether beliefs legitimizing dating violence predict dysfunctional social information processing (SIP) when adolescents deal with ambiguous dating situations, and whether this more proximal cognitive processing acts as a mediator between acceptance of violence beliefs and dating violence perpetration. Participants were 855 high school students who completed self‐report measures at three time points, with a 1‐year interval between them. SIP did not act as a mediator, but the emergence of anger emotions in dating conflict situations, along with aggression‐justifying beliefs, were revealed as essential in explaining dating violence. Previous aggression also explained a subsequent higher anticipation of positive consequences for aggressive acts. We discuss the implications for prevention and treatment strategies with adolescents. - Journal of Research on Adolescence, EarlyView.