Adnexal torsion is a rare cause of acute abdominal pain during pregnancy. It is frequently associated with ovarian stimulation for in vitro fertilization (IVF) or with ovarian masses, mainly of functional origin. It is uncommon for a normal-sized ovary to undergo torsion. Torsion of the ovary during pregnancy is common during third trimester. Adnexal torsion is rarely bilateral and is more common on the right side, perhaps because the sigmoid colon leaves a limited space for left adnexal mobility. Here we report a case of 23-year-old primigravida with 8 weeks pregnancy presented with sever left abdominal pain. Left abdominal tenderness was detected. Transabdominal ultrasound scan reported left adnexal torsion. Laparotomy and then left salpingo-oophorectomy were performed.