The 2017–18 United Counties League season (known as the 2017–18 ChromaSport & Trophies United Counties League for sponsorship reasons) was the 111th in the history of the United Counties League, a football competition in England.
The constitution for Step 5 and Step 6 divisions for 2017–18 was announced on 26 May 2017.
[1] The Premier Division featured 19 clubs which competed in the division last season, along with three new clubs:
Division One featured 16 clubs which competed in the division last season, along with four new clubs: