--- - |2+ Abstract Background Disorganised attachment in childhood has been considered an important early marker for the development of socio‐emotional and mental health problems. This review critically examines the current evidence and methodology employed to assess the influence of perinatal maternal mental health on disorganised attachment in infancy. Methods A search revealed 1 149 articles reporting studies examining predictors of disorganised attachment. An additional 564 grey literature articles were identified via bibliographic searches. After screening for inclusion of maternal mental health measures and use of the Strange Situation Procedure, 28 articles met inclusion criteria. Results Few studies robustly examined clinical levels of maternal mental health over time and the potential effects on infant disorganised attachment. Still, the bulk of current evidence does not support a strong positive association between disorganised attachment and low to moderate levels of maternal depression. The relationship between disorganised attachment and chronic and/or severe maternal depression is unclear given the dearth of research into the area. Limited research has examined other mental health disorders, with one study suggesting borderline personality disorder is associated with disorganised attachment. A level of bias in the literature was evident, with many studies recruiting non‐clinical samples and excluding those with significant mental health concerns. Conclusions Most non‐significant findings were reported in non‐clinical samples, while most positive findings were reported in clinical samples, suggesting that severity of mental disorder may be a critical factor. Further research on the relationship between disorganised attachment and chronic and severe maternal depression, psychotic, trauma, bipolar, and personality disorders is required. - Clinical Psychologist, EarlyView.