Operating room list errors are often cited as leading to wrong-side, wrong-site or wrong-procedure errors. This retrospective study analyzed two years of data from the United Kingdom and found that while no wrong-side, wrong-site or wrong-procedure surgeries were performed during the period, 0.29% of cases (86 cases) included a list error. Wrong-side list errors accounted for the majority of all list errors (72%). Tracking and reducing operating room list errors may help to prevent wrong-side, -site, or -procedure errors.