Background: Globally 117.3 million people are displaced due to war, with one in five refugees experiencing psychological distress. Despite the availability of numerous psychological interventions for war refugees, their overall efficacy is still unexplored. Thus, this review examines the effectiveness of psychological interventions in reducing the mental health issues of war refugees. Methods: A systematic search was conducted in PubMed, Web of Science, APA PsycNET, ScienceDirect and Google Scholar for studies published on the effectiveness of psychological interventions for mental health issues among war refugees in July 2024. JBI and NHLBI checklists were employed to appraise the risk of bias in the included studies. Review Manager version 5.4 was used to run the meta-analysis. Results: Out of 22,197 initially identified records, a total of 21 studies were included for systematic review and eight randomized controlled trials (RCTs) for meta-analysis. Random effects meta-analysis showed significant medium effect size for psychological interventions (SMD = -0.69; 95 % CI:0.87, -0.51; p < .00001) in reducing the mental health issues among war refugees. Sub group analysis based on the mode of delivery revealed that interventions delivered through in-person mode reported a significant large effect size (SMD = -1.03; 95 % CI:1.36, -0.71; p < .00001) while, telehealth interventions showed significant small effect size (SMD = -0.44; 95 % CI:0.61, -0.28; p < .00001). Conclusion: In-person and telehealth based psychological interventions offer promising findings in addressing mental health issues among war refugees. However, given the barriers to accessing face to face treatments and limited evidence on telehealth interventions, future research on digital interventions is recommended.