Context: Polycystic ovary syndrome (PCOS) is a complex, chronic, and under-recognized disorder. Diagnosis experience may have lasting effects on well-being and self-management. Objective: To investigate PCOS diagnosis experiences, information provided, and concerns about PCOS. Design: Cross-sectional study using an online questionnaire. Setting: Recruitment via support group web sites in 2015 to 2016. Participants: There were 1385 women with a reported diagnosis of PCOS who were living in North America (53.0%), Europe (42.2%), or other world regions (4.9%); of these, 64.8% were 18 to 35 years of age. Main Outcome Measures: Satisfaction with PCOS diagnosis experience, satisfaction with PCOS information received at the time of diagnosis, and current concerns about PCOS. Results: One-third or more of women reported >2 years (33.6%) and ≥3 health professionals (47.1%) before a diagnosis was established. Few were satisfied with their diagnosis experience (35.2%) or with the information they received (15.6%). Satisfaction with information received was positively associated with diagnosis satisfaction [odds ratio (OR), 7.0; 95% confidence interval (CI), 4.9 to 9.9]; seeing ≥5 health professionals (OR, 0.5; 95% CI, 0.3 to 0.8) and longer time to diagnosis (.>2 years; OR, 0.4; 95% CI, 0.3 to 0.6) were negatively associated with diagnosis satisfaction (independent of time since diagnosis, age, and world region). Women's most common concerns were difficulty losing weight (53.6%), irregular menstrual cycles (50.8%), and infertility (44.5%). Conclusions: In the largest study of PCOS diagnosis experiences, many women reported delayed diagnosis and inadequate information. These gaps in early diagnosis, education, and support are clear opportunities for improving patient experience.