Colorado public health officials investigated an outbreak of norovirus among persons who ate at a restaurant located in Greenwood Village, Colorado. The implicated meal date was December 31, 2015. Illness onsets occurred on January 2 and January 3, 2016. Three people were laboratory confirmed with norovirus. Three people were considered to be probable cases. Two additional cases of illness were classified as secondary cases. No one was hospitalized and no one died.