The 2017 County Championship (known for sponsorship reasons as the 2017 Specsavers County Championship), was the 118th cricket County Championship season. It was announced in March 2016 that the season would feature eight teams in Division One and ten teams in Division Two, meaning that at the end of the 2016 season only one team was promoted from Division Two whilst two were relegated from Division One. The first round of fixtures began on 7 April, with the final matches completed on 28 September. All of the fixtures starting on 26 June 2017 were played as day/night matches.