Background: the pediatri postoperative analgesia can be effectively controlled using regional analgesic techniques. both quadratus lumborum block (QLB) and erector spinae plan block (ESPB) have been used to achieve adequate postoperative analgesia in children. We compared the efficacy of both in postoperative pain management after lower abdominal surgery. Patients and methods: 60 patients with lower abdominal surgery received either bilateral -ultrasound guided -QLB (transmuscular anterior approach) or ESPB at the level of T8 transverse process with 0.5 ml/kg of 0.25% bupivacaine to achieve adequate postoperative analgesia. FLACC score was used to assess pain score after surgery and the need for rescue opioid analgesia. Results: The average dose of narcotic was lower and the time to the first dose required analgesic was after longer time in QLB group when compared to ESPB group. In addition, FLACC scores were lower in QLB group in comparison to ESPB group at the 2hrs., 4 hrs.’, 6 hrs., 12 hrs, 18 hrs. and 24 hrs. Conclusion: In pediatrics undergoing lower abdominal surgeries, the US guided QLB had higher analgesic efficacy than ESPB as it decreased opioid consumption and pain score with better hemodynamics and parents’ satisfaction and comparable complications.