This study aimed to evaluate the effect of lavender oil on relieving post cesarean incisional pain.A Quasi-experimental design was adopted in the current study. Setting: The study was conducted at the postpartum unit in Sueze-Canal University Hospital during the period from October 2013 to January 2014. A sample of convenience including 100 mothers was divided into two groups (study and control). Three tools were used for data collection, general charecteristic questionnaire, Visual Analogue Scale (VAS) and Modified Johansson Pain-O-Meter (MJPOM). The study group inhaled lavender oil and the control group received placebo. Results of the study showed highly statistically significant differences in pain intensity between the groups understudy (p<0.001), lavender oil was more effective with educated mothers and multiparous mothers. Conclusion; Lavender oil is a successful and safe complementary therapy in reducing pain after cesarean section. Results of the current study recommended that dissemination of lavender oil to all maternity hospital all over Egypt and added inhaled lavender oil into nursing curriculum in Port-Said.