To evaluate the pain severity level of Erector Spinae Plane (ESP) block compared to Transversus Abdominis Plane (TAP) block after elective cesarean section. This study enrolled sixty women aged 21-40 years with American Society of Anesthesiologists (ASA) II or III, scheduled for elective cesarean section receiving intrathecal anesthesia without analgesia. US-guided bilateral ESP or TAP block using ultrasound with injection of 20ml bupivacaine 0.25% at the end of surgery after skin closure. Pain severity was the primary outcome and secondary outcome included the first request of analgesia, the total dose of analgesic consumption, any complication and patient satisfaction. Visual analogue score was statistically significant lower in the ESP group. The mean time to first rescue analgesia was 12.43 ± 0.98 hr and 22.42 ± 1.28 hr in TAP group and ESP group, respectively, with (p < .001) and the 24h postoperative analgesic consumption was significantly lower in ESP group than TAP group with median (10mg vs 30mg) pethidine over 24h. Patient satisfaction was significantly higher in the ESP group. No adverse effects or complications were observed in our study. In this study, comparable postoperative pain relief was provided by US-guided bilateral ESP and TAP block, ESP block was associated with longer duration of analgesia, lower VAS pain score at rest and at movement, and lower total pethidine consumption during the first 24h compared to TAP block.