This systematic literature review examines the long-term mental health of war-refugees, focusing on the prevalence of mental disorders and the factors associated with them. The review includes 29 studies involving 16,010 adult war-affected refugees, with significant heterogeneity in prevalence rates of depression (2.3–80%), PTSD (4.4–86%), and unspecified anxiety disorders (20.3–88%). Methodological and contextual factors, such as country of origin and resettlement, significantly influence these rates. Pre-migration traumatic experiences and post-migration stressors are consistent risk factors, while poor socio-economic status is particularly associated with depression. The review highlights the need for more methodologically rigorous research to better understand the long-term mental health of war refugees.This systematic literature review examines the long-term mental health of war-refugees, focusing on the prevalence of mental disorders and the factors associated with them. The review includes 29 studies involving 16,010 adult war-affected refugees, with significant heterogeneity in prevalence rates of depression (2.3–80%), PTSD (4.4–86%), and unspecified anxiety disorders (20.3–88%). Methodological and contextual factors, such as country of origin and resettlement, significantly influence these rates. Pre-migration traumatic experiences and post-migration stressors are consistent risk factors, while poor socio-economic status is particularly associated with depression. The review highlights the need for more methodologically rigorous research to better understand the long-term mental health of war refugees.