Objective: A gastroenteritis outbreak was developed due to Campylobacter jejuni and Norovirus and affected thousands of people in Tokat province of Turkey between 29 March and 10 April 2009. In this study, we aimed to present clinical and epidemiological characteristics of this gastroenteritis outbreak, and share our experiences. Although there have been increasing number of gastroenteritis outbreaks originating especially from food and rarely from water in various countries to the best of our knowledge this was the first Norovirus and C. jejuni outbreak reported in our country.