The first day after childbirth, especially for primiparous mothers, is a critical period for mothers as they face various biological, psychological, and social changes and the need to adapt to their new roles, which can trigger anxiety. Slow Stroke Back Massage (S2BM) is expected to provide a relaxing effect to reduce anxiety. This study aims to determine the effectiveness of the S2BM technique in reducing anxiety in post-partum mothers at RSUDZA. The method used is a quasi-experimental study with a pre-post test with control group design. The population used in this study were primigravida post-partum mothers in Room Arafah 2 of the Dr. Zainoel Abidin Regional General Hospital. The sample consisted of 30 respondents. The intervention was carried out by providing Slow Stroke Back Massage (S2BM), which involved touching and pressing the skin on the back area of post-partum mothers. The instrument used was Spielberger's State Anxiety Inventory (STAI) questionnaire to measure the mothers' anxiety levels. The results of the independent T-test on anxiety levels in the post-test between the control and intervention groups obtained p=0.043. And the results of the paired sample T-test in the post-test between the control and intervention groups with p=0.001 showed that the S2BM intervention was effective in reducing anxiety in post-partum mothers. The S2BM action provides a relaxing effect on the muscles, which is beneficial for improving blood circulation, thereby increasing