Maladaptive anger and aggression are common in US military veterans and increase risk for impaired social relationships and functioning, justice-involvement and violence. Early life (before age 18) adversity predisposes veterans to later life psychopathology, though the link to increased later life anger is unclear. We analysed cross-sectional data of 158 post-9/11 veterans from the Translational Research Center for Traumatic Brain Injury and Stress Disorders study with and without a history of early life adversity (ns = 109 and 49, respectively). We explored the relationship among major clinical variables and current veteran anger (Dimensions of Anger Reactions) and whether the associations with these variables differed among participants with and without a history of retrospective self-reported early life adversity (Childhood Trauma Questionnaire). In the overall sample, posttraumatic stress disorder (PTSD) and depression severities had the strongest associations with current veteran anger (βs = 0.261 and 0.263; p-values = 0.0022 and 0.0103, respectively). In the subsample without early life adversity, only PTSD severity was significantly associated with anger (β = 0.577, p = 0.0004). In the early life adversity subsample, this strong association weakened and was no longer significant (β = 0.168, p = 0.1007); instead, anxiety and depression severities showed moderate associations with anger (βs = 0.243 and 0.287, p-values = 0.0274 and 0.0130, respectively). Findings suggest that clinicians should screen veterans with history of early life adversity for depression and anxiety when anger is present.