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Mirroring the traditional in\u2010person delivery, few studies have assessed the role of therapist\u2010guided, manual\u2010based CBT for OCD delivered in real\u2010time via videoconferencing methods. The present study sought to fill this gap by comparing in\u2010person and online delivery of group\u2010based CBT for the treatment of OCD. A convenience sample of participants with moderate to severe OCD (<jats:italic>n<\/jats:italic>\u2009=\u2009144) were recruited from a naturalistic database from two large OCD specialty assessment and treatment centres. Patients received group\u2010based CBT that was provided in\u2010person (pre\u2010COVID\u201019 pandemic; March 2018 to March 2020) or online via videoconferencing (during the COVID\u201019 pandemic; March 2020 to April 2021). In both delivery methods, treatment consisted of 2\u2010h weekly sessions led by trained clinicians. Analyses revealed that, regardless of treatment modality, both in\u2010person and online groups demonstrated significant, reliable, and statistically equivalent improvements in OCD symptoms post\u2010treatment. Videoconferenced, clinician\u2010led CBT may be a promising alternative to in\u2010person delivery for those with moderate to severe OCD symptoms.<\/jats:p>","DOI":"10.1002\/cpp.2908","type":"journal-article","created":{"date-parts":[[2023,9,12]],"date-time":"2023-09-12T23:49:25Z","timestamp":1694562565000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Online versus in\u2010person delivery of cognitive behaviour therapy for obsessive compulsive disorder: An examination of effectiveness"],"prefix":"10.1002","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6759-0776","authenticated-orcid":false,"given":"Diana M.","family":"Lisi","sequence":"first","affiliation":[{"name":"Frederick W. 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