Research on the effects of intergroup competition has relied on various conceptual approaches and has produced inconsistent findings. Following a review of the intergroup competition literature, we propose a framework which emphasizes that the influence of intergroup competition varies primarily according to participants’ construal of potentially competitive events. We assess this via two variables: competitive intergroup perceptions (CIP), the perception that one’s ingroup and another group(s) in the current situation are attempting to gain a reward at each other’s expense; and competitive intergroup motivations (CIM), the individual desire for one’s group to do better or acquire more of a reward than the other group(s). In four studies that presented participants with an ambiguously competitive intergroup setting and administered CIP and CIM scales adapted for the context, both variables were empirically nonredundant (Studies 1–4) and showed unique relations with intergroup outcomes: CIM, rather than CIP, was directly associated with greater intergroup bias (Studies 2–4), discriminatory intentions (Study 3), and discriminatory behavior (Study 4). CIP consistently registered an indirect effect on intergroup bias and behavior through CIM. Our results suggest that in ambiguous group contexts, CIM facilitates the pursuit of goals for the ingroup, which may involve expressing intergroup bias and more antisocial outgroup behavior, and that these tendencies are quite sensitive to corresponding changes in CIP. The current framework offers more precise insights into the influence of competitive group dynamics, and can easily be integrated with other research paradigms to determine how and when intergroup competition produces intergroup bias and discrimination.