Maternal and infant mortality rates in Indonesia remain high, with one contributing factor being the low rate of exclusive breastfeeding. In the working area of UPTD Puskesmas Plered, Cirebon Regency, the exclusive breastfeeding coverage has not yet reached the national target. Oxytocin massage is a natural method that can stimulate the oxytocin hormone to improve breast milk production. This study aims to determine the effect of oxytocin massage on the smoothness of breast milk production in breastfeeding mothers. This research used a pre-experimental method with a one-group pre-test–post-test design and a quantitative approach. A total of 20 postpartum breastfeeding mothers were selected using purposive sampling. Data were collected using checklists and questionnaires. The Wilcoxon test with a significance level of 0.05 was used to assess the effect of oxytocin massage on breast milk production. The results showed that before the oxytocin massage intervention, most mothers experienced poor milk production (65%). After the massage, the majority of mothers experienced smooth milk production (95%). The Wilcoxon test showed a significant result with a p-value of 0.000 (<0.05), indicating that oxytocin massage significantly affects the smoothness of breast milk production. Based on these findings, it can be concluded that oxytocin massage is effective in improving breast milk production. Therefore, midwives are encouraged to actively provide education to breastfeeding mothers regarding the benefits of oxytocin massage. Mothers are also expected to better understand the importance of this method in supporting the success of exclusive breastfeeding. Future researchers are recommended to use larger sample sizes and more varied research designs.