Objective: Research has linked individual differences in justice and rejection sensitivity to aggression in different age groups. However, different forms and functions of aggression have not been considered when investigating these links in adults. Furthermore, no attention has been paid to verbal aggression or the conjoint effects of justice and rejection sensitivity. Method: The present study assessed rejection sensitivity as well as victim, observer, and perpetrator justice sensitivity in 349 German adults. Links with self-reported forms (physical, relational, verbal) and functions (proactive, reactive) of aggression were examined. Results: In structural equation models controlling for age and gender, higher victim sensitivity predicted higher relational, proactive, and reactive aggression and higher observer sensitivity predicted higher physical and verbal aggression. In contrast, higher perpetrator sensitivity predicted lower physical, relational, verbal, and proactive aggression. Higher rejection sensitivity predicted higher physical and reactive, but lower verbal aggression. Using a 2-dimensional definition of aggression considering forms and functions of aggression at the same time yielded similar results. There were marked gender differences. Conclusion: Justice and rejection sensitivity may explain individual differences in forms and functions of aggression in adults and should therefore be considered in the planning of preventive and intervention measures. (PsycINFO Database Record (c) 2016 APA, all rights reserved)