Symptoms of disordered eating are common among patients seeking bariatric surgery, and assessment of eating pathology is typical in pre-surgical evaluations. A systematic review was conducted to evaluate the definitions, diagnostic criteria and measures used to assess disordered eating in adults seeking bariatric surgery. The review identified 147 articles featuring 34 questionnaires and 45 interviews used in pre-surgical assessments. The Questionnaire on Eating and Weight Patterns Revised and the Structured Clinical Interview for DSM were the most frequently used questionnaire and interview respectively. Variations to pre-surgical diagnostic criteria included changes to the frequency and duration criteria for binge eating, and inconsistent use of disordered eating definitions (e.g., grazing). Results demonstrate a paucity of measures designed specifically for an obese sample, and only 24% of questionnaires and 4% of interviews used had any reported psychometric evaluation in bariatric surgery candidates. The psychometric data available suggest that interview assessments are critical for accurately identifying binge episodes and other diagnostic information, while self-report questionnaires may be valuable for providing additional information of clinical utility (e.g., severity of eating, shape and weight-related concerns). Findings highlight the need for consensus on disordered eating diagnostic criteria and psychometric evaluation of measures to determine whether existing measures provide a valid assessment of disordered eating in this population. Consistent diagnosis and the use of validated measures will facilitate accurate identification of disordered eating in the pre-surgical population to enable assessment of suitability for surgery and appropriate targeting of treatment for disordered eating to optimise treatment success.