Nipple trauma is among the challenges that a lactating mother may face during early postpartum period. This study aimed to evaluate the effect of olive oil on nipple trauma among lactating mothers. A quasi-experimental study design was carried out at three private obstetric centers in Menyat El-Nasr City in Dakahlia governorate from January, 2017 to July, 2017. A purposive sample technique of 116 lactating mothers suffering from nipple trauma at their early puerperal period were chosen according to the inclusion criteria and assigned randomly into two equal groups of 58 lactating mothers; group one was the study group who rubbed olive oil on nipple after each feeding; group two was the control group who received routine pharmacological management for nipple trauma according to physician prescription. Two tools were used to collect the data; Structured Interview Schedule, and Nipple Trauma Score. Results of the present study showed that, majority of lactating mothers who used olive oil had faster recovery of nipple trauma post intervention more than control group with statistical significant differences. Conclusion: Olive oil is a safe natural method that can be used to treat nipple trauma among lactating mothers.