Objectives: Truncal blocks have a place within multimodal analgesia techniques in abdominal surgery. The quadratus lumborum block is an abdominal truncal block used for somatic analgesia of both the upper and lower abdomen. In this prospective, double blind, randomized study, we aimed to compare quadratus lumborum block and transversus abdominis plane block in pediatric patients undergoing laparoscopic lower abdominal surgery. Patient and methods: A total of 60 pediatric patients of both sex, ASA I and II, aged between 1 to 7 years, scheduled for laparoscopic lower abdominal surgery, under general anesthesia were included in the study. Patients were randomly allocated into 2 equal groups each containing 30 patient. Group (QLB) received bilateral ultrasound guided Quadratus Lumborum Block and group (TAPB) received bilateral ultrasound guided transversus abdominis plane block. Pain levels were assessed. Results: the patients who received quadratus lumborum block showed lower post-operative pain score and receive less rescue analgesia than TAP block group. Parent satisfaction scores were higher in the quadratus lumborum block group (P < 0.05). Conclusions: The results of this study showed that in pediatric patients undergoing elective laparoscopic lower abdominal surgeries the quadratus lumborum block provided longer and more effective postoperative analgesia compared with the transversus abdominis plane block.