Background: Hidradenitis Suppurativa (HS) is a painful, chronic inflammatory skin disease. Global estimates of prevalence vary between 0.03% and 4% of the population. Our main aim was to determine HS prevalence in the Australian adult population focussing on the demographics, management pathways and diagnosis rate of individuals living with HS., Methods: In this population-based cross-sectional study, 17,050 individuals representative of the Australian adult population were asked through face-to-face household interviews to answer a previously validated HS screening questionnaire with high diagnostic power. Individuals who screened positive were asked additional questions, including previous diagnosis of HS and number/type of physicians consulted regarding their condition., Results: 11,433 Australian residents answered the HS questionnaire, 88 screening positive for HS (0.77%; 95% CI 0.62-0.95). Considering the previously reported sensitivity (0.97) and positive predictive value (0.85) of the screening questionnaire, HS prevalence was estimated to be 0.67% (95% CI 0.53%-0.84%). 6 of 88 suspected HS individuals reported a pre-existing HS diagnosis (6.8%; 95% CI 3.2%-14.1%). 25.6% of the undiagnosed individuals suspected of having HS had not seen any clinicians regarding their boils; the remaining ones had consulted General Practitioners (96.7%), and clinicians from different specialties. Comparisons of individuals who screened positive for HS versus those who screened negative demonstrated statistically significant differences in gender (p = 0.0046), age (p<0.0001), BMI (p = 0.0307), smoking status (p<0.0001), employment status (p<0.0001) and income (p = 0.0321)., Conclusions: The prevalence of HS in Australia was estimated to be 0.67% (95% CI 0.53%-0.84%). The diagnosis rate amongst the suspected HS cases was low, which appeared to be due to a combination of patients not seeking help and decentralization of care. Individuals suspected of having HS were more likely to be females, young, obese, smokers, unemployed or at home duties and having lower annual personal income in comparison with individuals not suspected of having HS., Competing Interests: AbbVie Pty Ltd funded the research for these studies and participated in the studies design; studies research; analysis and interpretation of data; and writing, reviewing and approving of this publication. This does not alter the authors’ adherence to PLOS ONE policies on sharing data and materials. M Calao, JL Wilson, A Watts receive a salary as employees of AbbVie and may also receive AbbVie stock and/or stock grants. D Rubel is principal investigator for the following HS studies: M11-810 and M12-555, HS registry H13-147, HS validation study 10610, and HS epidemiology study 10756, as well as M13-674 Adalimumab nail psoriasis study; and has served on the Advisory Boards for Abbvie, Eli Lilly, Celgene, Galderma, GlaxoSmithKline, Janssen, Leo Pharma, Novartis, and Sanofi. L Spelman has served on the advisory Boards for Abbvie, Eli Lilly, Novartis and Sanofi; and undertakes sponsored clinical research for AbbVie, Amgen, Ascend Biopharmaceuticals, Australian Wool Innovation Limited, Celgene, Dermira, Eli Lilly, Galderma, Genentech, GlaxoSmithKline, Leo Pharma, Merck, Novartis, Phosphagenics, Regeneron, and has received sponsored travel from AbbVie, Novartis, and Janssen- Cilag. GB Jemec disclosures are as follows: AbbVie: Adboard, consultant, investigator, speaker, unrestricted grant. Coloplast: Consultant, speaker. Leo pharma: Consultant, investigator, speaker, unrestricted grant. Galderma: Speaker. Janssen-Pharma: Adboard MSD: Adboard. Novartis: Adboard, consultant, investigator, unrestricted grant. Regeneron: Investigator. UCB: Consultant and investigator. InflaRX: Consultant and investigator. L Billot is an employee of The George Institute for Global Health which has received payment from AbbVie for the conduct and analysis of the prevalence study.