Background: Benson relaxation technique is an effective and safe method for reducing the intensity of post cesarean section pain. Aim: The present study aimed to evaluate effect of Benson relaxation technique on intensity of post cesarean section pain among primipara women. Design: A quasi experimental design was used to fulfill the aim of the present study. Setting: Post-partum unit of Obstetrics and Gynecology at Benha university hospital. Sample: A Purposive sample consisted of 120 primipara women after cesarean section which divided into two groups study and control group (60 for each).  Tools: Data was collected through two main tools; I-A structured interviewing questionnaire, II-The short-form McGill pain questionnaire. Results: A statistically significant difference was observed in pain intensity between two groups after application of Benson relaxation technique at the four phases (p< 0.05) as pain intensity decreased in the study group more than the control group. Conclusion: Practicing of Benson's relaxation technique had a positive effect on reducing the intensity of post cesarean section pain among primipara women. Recommendation: Benson relaxation technique should be recommended as non pharmacological routine of care in maternity hospitals for reducing intensity of post cesarean pain.