World data shows that depression has a 50% higher percentage to accur in women due to hormonal, genetic, psychosocial and social stress changes. World data also shows that 13% of postpartum women experience depression. In developing countries, postpartum depression was high, which is at 19.8%. One of the risk factors that influence the occurrence of postpartum depression is unplanned pregnancy. This study aims to estimate the magnitude of the effect of unplanned pregnancy on postpartum

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... n based on a number of previous similar studies. Subjects and Method: This was a systematic review and meta-analysis. The articles used in this study were obtained from several databases, including PubMed, Google Scholar, and Springer Link. The articles used in this research were articles published from 2005-2020. The article search was carried out by considering the eligibility criteria defined using PICO. The population in this study included postpartum mothers with intervention, namely unplanned pregnancy, the comparison namely planned pregnancy and the outcome was postpartum depression. The keywords to look for articles were: "unplanned Pregnancy" AND "postpartum depression OR" postnatal depression" "unplanned pregnancy" AND "postpartum depression" AND "adjusted odds ratio". The articles included in this study were full text articles with an observational study design. Articles were collected using PRISMA flow diagrams. Articles were analyzed using the Review Manager 5.3 application. Results: There are 17 articles reviewed in this study. Meta-analysis of 4 cohort studies show that unplanned pregnancy increased the risk of postpartum depression (aOR= 1.27; 95% CI= 1.09 to 1.47; p <0.001). A meta-analysis of 13 cross-sectional studies show that unplanned pregnancy increased the risk of postpartum depression (aOR= 2.28; 95% CI= 1.67 to 3.12; p <0.001). Conclusion: An unplanned pregnancy increases the risk of postpartum depression.