Anxiety, aggression/agitation, apathy and disinhibition are common neuropsychiatric consequences of acquired brain injury (ABI); these consequences can cause functional impairment and lead to reduced social integration. This systematic review aims to provide an examination of the current evidence on psychological interventions for treating these consequences. Two reviewers selected potential relevant articles, retrieved from five literature databases; methodological quality was assessed and appraised. A total of 5207 studies were found, of which 43 were included: 21 studies for anxiety, 18 for aggression, two studies for apathy, and six for disinhibition. Three studies addressed multiple consequences. Four high-quality (i.e., Class I and II) studies showed significant decreases in anxiety after cognitive behavioural therapy (CBT). In total, 14 studies consistently showed significant decreases in aggression/agitation after behavioural management techniques or anger management sessions. Substantial variability existed in the examined interventions and in their effects on apathy and disinhibition. Unfortunately, firm conclusions and recommendations for clinical practice are considered premature, due to concerns about the methodology used. However, this review yielded new evidence on the effectiveness of CBT for anxiety symptoms post-ABI and there has been some response to the ongoing call for studies with high methodological quality.