Abstract Background Nerve root or myofascial irritation at the abdominal wall is a common cause of pain following surgeries such as cholecystectomy, cesarean section, prostatectomy, hysterectomy and transplant surgery. Aim of the Work to test the efficacy of ultrasound guided bilateral erector spinae plane block versus ultrasound guided bilateral oblique subcostal tap block as regards its efficacy, hemodynamic stability, onset of post-operative pain, amount of post-operative narcotics used. Patients and Methods In the current study fifty eight patients scheduled for elective laparoscopic cholecystectomy received general anesthesia were included. Patients were divided randomly into two groups, each group consisted 29 patients. Group A: Patients in this group received bilateral US guided ESP block at the end of surgery. Group B: Patients in this group received bilateral US guided OSTAP block at the end of surgery. Results As regard the analgesic parameters recorded; in the current study, the VAS was significantly lower in group A (ESP block) when compared with that of group B (OSTAP block) and showed significant difference between both groups at 6,8 and 10hrs postoperatively. Also, time to rescue analgesia, there was clinically and statistically highly significant longer time to 1st rescue analgesic in group A (ESP block) was 15.25±1.50 hours compared to that of group B (OSTAP) was 9.86±2.01 hours These findings were in an array with a case series done by Luis-Navarro and his colleagues who reported that the first rescue analgesic was required only at 16 hours after ESP block. In the current study, total morphine consumption “mg” with the mean total consumption in each of Group was 4.45±0.42 mg in the ESP group compared with 5.44±0.37 mg in the OSTAP group there was highly statistically significant higher mean of total analgesic consumption in group B compared to Group A. Conclusion bilateral ultrasound-guided ESP block provides more potent and longer postoperative analgesia with less morphine consumption than OSTAP block after laparoscopic cholecystectomy