We propose that self-uncertainty moderates responsiveness to perceived variations (e.g., breaches or provisions) in procedural justice. Specifically, we tested the hypothesis that high (compared to low) self-uncertainty individuals are more responsive to variations in procedural justice, because they use procedural information to infer their organizational acceptance, respect, or social standing. In six experiments, high (compared to low) self-uncertainty individuals responded with affective, cognitive, and behavioral intensity to perceived variations in procedural justice. In particular, they felt worse, judged the procedure as unfair, and were unwilling to cooperate when they were deprived (as opposed to granted) voice. However, this pattern was cancelled out when these individuals engaged in a self-affirming activity. The findings establish the self in general, and self-uncertainty in particular, as a crucial moderator of responses to procedural information.