Background. Aromatherapy is one of the non-pharmacological methods, it is safe and effective for improve sleep pattern postoperative. Aim: This study was aimed to determine the effect of aromatherapy massage on postoperative sleep pattern among school age children. Design: A quasi-experimental research design was utilized. Setting: The study was conducted at the pediatric surgical unit in Assiut University Children Hospital. Subjects: It included 100 school age children suffer from postoperative poor sleep pattern. It was divided into two groups, experimental group (50 children who received aromatherapy massage beside the hospital routine care) and control group (50 children who received hospital routine ward care).Tools: Two tools were used to collect necessary data which included structured interview questionnaire for personal data and sleep assessment scale. Results: The results showed that they are statistical significant differences between the two groups in pretest, first posttest, and second posttest mean score (11.66 ± 2.54, 9.50 ± 0.97and 5.80 ± 0.70) respectively as regard sleep pattern. Conclusion: Aromatherapy massage with lavender oil may be an effective therapeutic option for postoperative sleep pattern. There is a significant positive effect of aromatherapy. Recommendation: Using aromatherapy massage as routine interventions for improving postoperative poor sleep pattern in children.