Background: Endometriosis is defined as the presence of functional endometrial glands and stroma outside of the uterine cavity. Although laparoscopy is the standard of reference for diagnosis of endometriosis, reliable identification of the disease before laparoscopy would aid the gynecologist in choosing the preferred therapeutic approach, medical or surgical. Ultrasound is performed initially, but MRI is increasingly being used, particularly when sonographic findings are unclear, when deep pelvic endometriosis is suspected or when surgery is planned. Objective: This study aimed to evaluate the accuracy of Magnetic Resonance Imaging in diagnosis of Endometriosis. Patients and Methods: 30 Premenopausal female Patients with clinical and/or sonographic suspicion of endometriosis underwent pelvic MRI. All our imaging results were finally compared to the laparoscopic results with histopathologic verification which was our gold standard. The main outcome parameters, The Sensitivity, Specificity, positive predictive value (PPV), negative predictive value (NPV) and accuracy of MRI in diagnosing endometriosis were calculated. Results: The Sensitivity, Specificity, positive predictive value (PPV), negative predictive value (NPV) and accuracy of MRI in diagnosing endometriosis were 95.65%, 57.14%, 88%, 80%, 86.7% respectively. Conclusion: MRI is the best problem-solving tool as in cases of indeterminate adnexal findings on sonography, when deep infiltrating endometriosis is suspected, or for presurgical mapping.