Eating disorders (EDs) are highly comorbid with obsessive-compulsive disorder (OCD). In order to develop treatments which better address commonly comorbid ED and OCD symptoms, it is important to identify potential shared mechanisms. Two potential shared mechanisms are maladaptive perfectionism and intolerance of uncertainty (IU). We aimed to assess how maladaptive perfectionism and IU may contribute to the maintenance of ED and OCD symptoms in individuals with EDs.