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Cognitive theories of obsessive-compulsive disorder (OCD) suggest that dysfunctional beliefs influence symptoms. However, well-established belief domains do not fully explain OCD symptomatology, suggesting other cognitive mechanisms may be involved. An additional belief domain which may play a role in OCD is beliefs about losing control. Indeed, these beliefs have been found to be associated with OCD symptoms. However, the relationships between beliefs about losing control and other OCD phenomena, including other relevant dysfunctional beliefs, is unclear. The aim of this study was to examine the relationships between beliefs about losing control and appraisals hypothesized to be relevant to OCD. A total of 163 participants completed the experimental protocol, wherein they received false (positive or negative) feedback regarding the likelihood they may lose control and completed a vignette task asking them to read hypothetical scenarios relevant to OCD concerns (checking, and aggressive thoughts). Vignettes were followed by questions and prompts used to measure OCD-relevant appraisals. Based on MANOVAs, beliefs about losing control had a significant impact on appraisals in the checking, F (151) = 5.55, p =.001, and aggressive thoughts, F (151) = 2.898, p =.037, vignettes. However, planned comparison indicated that in the aggressive thoughts vignettes, this effect was in the opposite direction than was hypothesized. The losing control induction may have inadvertently influenced participants' beliefs about the utility of thought control. Findings provide preliminary evidence for an association between beliefs about losing control and OCD-relevant appraisals. • The causal role of beliefs about losing control on OCD-cognitions was investigated. • Beliefs about losing control were manipulated using false feedback. • Some evidence for associations between losing control and OCD-cognitions. • Findings were limited by issues with the experimental paradigm. [ABSTRACT FROM AUTHOR]