Background Recent literature suggests that some patients may develop addictive disorders after bariatric surgery, in particular after Roux-en-Y gastric bypass (RYGB). These may include traditional addictions and so called "behavioral addictions," although prevalence data on the latter have not been published. The objective of this study was to establish the prevalence of addictive behaviors in adults after RYGB. Methods Participants from a large observational study of bariatric surgery who had undergone RYGB were recruited to complete additional measures. Of 241 consented participants, 201 provided data (i.e., Structured Clinical Interview for DSM-IV Axis I [SCID], additional Impulsive Control Disorder Modules, and various self-report measures, including the Alcohol Use Disorder Identification Test [AUDIT]) to assess status before surgery and in the first 3 postoperative years. Results Based on the SCID, 16 (8.0%) developed alcohol use disorder [AUD] within 3 years post-RYGB, 7 (43.8%) of whom had no history of AUD. When both the SCID and AUDIT were used to identify AUD, the corresponding numbers/percentages were 32 (18.4%) and 13 (40.6%). Data on other behavioral addictive disorders indicated 19 (9.5%) had a postsurgery disorder, 6 (31.6%) of whom had no history. Conclusion These data add to a growing literature suggesting there is a substantial risk for the development of AUD after bariatric surgery. Understanding the risk for nondrug-related addictive disorders requires more data from larger studies before clear conclusions can be drawn.