The 2015–16 Dorset & Wilts 4 consisted of five teams; two of which were based in Dorset and one each in Hampshire, Somerset and Wiltshire. The season started on 26 September 2015 and ended on 2 April 2016.
Participating teams and location
Two of the five teams participated in the previous season's competition. The 2014-15 champions, Dorchester III, along with runners up, Lytchett Minster II, were promoted to Dorset & Wilts 3 South. As the basement league in Dorset & Wilts there was no relegation.