Fear of negative evaluation (FNE), a core feature of social anxiety disorder, has been prospectively related to eating pathology over and above other established risk factors, suggesting that it may be an important cognitive risk factor for eating disorders. The present study examined reciprocal longitudinal relations among FNE and eating disorder risk factors using a female undergraduate sample (N = 82) enrolled in an eating disorder prevention program. Cross-lagged panel analysis revealed that FNE was a determinant of subsequent body dissatisfaction and eating disorder symptoms. Fear of negative evaluation also predicted subsequent thin-ideal internalization among participants with high body mass index (BMI), but not among those with low BMI. Fear of negative evaluation did not predict future dietary restraint or negative affect but was itself predicted by prior levels of thin ideal internalization, body dissatisfaction, dietary restraint, and negative affect. Findings suggest that FNE may be a useful target for reducing body image concerns and maladaptive eating behavior.