Being at a disadvantage and perceiving this predicament to be unfair are at the core of the experience of personal relative deprivation. Previous research has shown that personal relative deprivation is associated with interpersonal aggression. The present longitudinal study extended these investigations by examining the impact of personal relative deprivation on aggression over time. In fact, personal relative deprivation at Time 1 was associated with reported aggression at Time 2 even when controlling for the impact of aggression at Time 1. As a secondary goal, we aimed to show that the effect of personal relative deprivation (i.e., increased aggression) may spread through the participant's social network. Egocentric networking data showed that individuals who perceive their friends as being personally deprived are more aggressive and that this relationship statistically holds when taking the individual's level of personal relative deprivation into account. Limitations of this approach are discussed.