There is substantial evidence that body image is a clinically important element of eating pathology, and that patients' body checking cognitions and behaviours are key elements in the maintenance of that body image. However, there is little understanding of individual differences in body checking. This study considered the potential role of narcissism and narcissistic defences in driving body checking cognitions and behaviours. 68 eating-disordered and 70 non-clinical women completed well-validated measures of body checking and narcissism. There were specific patterns of association between different elements of narcissism and different aspects of body checking. These patterns are compatible with a model where body checking serves the defensive function of maintaining self-esteem, rather than promoting positive levels of narcissistic self-esteem.