Although theoretical accounts of body dysmorphic disorder (BDD) posit that repetitive negative thinking (RNT) and metacognition may play a role in the maintenance of the disorder; presently, the direct relationship between these two variables and body dysmorphic symptoms has not been empirically assessed. Study one aimed to evaluate a measure of repetitive thinking modified for BDD, and study two used this measure to investigate the association between RNT and BDD symptoms in an analogue sample with body dysmorphic concern. Through two online surveys, (N = 582) participants from Macquarie University and the University of Queensland completed measures of BDD, RNT, positive metacognitive beliefs about RNT, depression and eating disorder symptoms. Exploratory factor analysis of the Repetitive Thinking Questionnaire for BDD yielded two factors, consistent with the factor structure of the original Repetitive Thinking Questionnaire. In study two, a sample with no body dysmorphic concern (N =31) was matched to a sample with body dysmorphic concern (N =31) on age, gender, and level of depression. Results indicated participants with body dysmorphic concern reported more RNT and endorsed more positive beliefs about RNT compared with the control group. Within the BDD group, positive beliefs about RNT predicted RNT; however, RNT did not predict BDD symptom severity. Findings suggest elevated RNT and an increased amount of unhelpful metacognitive beliefs may be present in individuals with body dysmorphic symptoms; theoretical implications are discussed.