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Objective:  To determine the prevalence of occult microscopic endometriosis in patients with chronic pelvic pain and negative laparoscopy., Methods: A retrospective cross-sectional study included women who underwent laparoscopic evaluation for chronic pelvic pain by three fellowship-trained gynecologic surgeons at a community hospital from January 2011 to December 2016. The aim was to evaluate the prevalence of microscopic endometriosis in this population., Results:  In 142 patients with clinically negative peritoneum on laparoscopy, 39% had occult microscopic endometriosis. Cramping pain score during menses was found to be lower in the positive biopsy group (6.9 vs 8.0, P=0.046). No differences were appreciated in age of menarche, pain during various parts of the menstrual cycle, or duration of symptoms. The biopsy-positive group had a younger age at time of evaluation, although not statistically significant (P=0.179). Current use of hormones affected neither biopsy results nor menstrual or pain characteristics. Detection was similar between robotic and laparoscopic cases and operative morbidity was minimal., Conclusion: Occult microscopic endometriosis may be present in approximately 39% of patients with clinically negative appearing peritoneum undergoing laparoscopy for chronic pelvic pain. Given this, biopsies should be performed in patients undergoing laparoscopy who do not have visible lesions., (© 2020 International Federation of Gynecology and Obstetrics.)