In May 2013 public health investigators in Minnesota investigated an outbreak of sapovirus among persons who attended a birthday party buffet on April 28. The party was held at a restaurant in Minneapolis. Sixty-eight restaurant patrons were interviewed and 33 (49%) patrons met the case definition (all from the birthday party). The median incubation period was 54 hours (range, 11 to 95 hours). The median duration of illness was 2.5 days (range, 1 to 6 days) for 30 cases who had recovered from their symptoms at the time of the interview. Stool specimens collected from 4 persons were positive for sapovirus GI. Cases had eaten a variety of foods from the buffet, including sandwich meats, lettuce, tomato, cheese, rolls, bread, condiments, pasta salad, coleslaw, chips and dessert. The food was served self-serve by the group and there was no refrigeration or shields. By univariate analysis consuming turkey and coleslaw were associated with illness. After multivariate logistic regression, both turkey and coleslaw remained independently associated with illness. Illness histories were obtained from 55 restaurant employees. One employee had onset of diarrheal illness on May 3. This employee did not work on April 28. An on-site inspections conducted on May 6 and May 7 revealed that there was no documentation of employee illness on the illness log. A glove order was issued for all employees when handling ready-to-eat foods until further notice. Investigators concluded that this was a sapovirus outbreak with turkey and coleslaw as the implicated vehicles of transmission. The source of contamination was not identified but could have been an unidentified infected food work or a birthday party attendee. However, neither could be confirmed.