2015–16 Southern Football League

The 2015–16 season is the 113th in the history of the Southern League since its establishment in 1894. From the 2014–15 season onwards, the Southern League is known as Evo-Stik League Southern, following a sponsorship deal with Evo-Stik.

The league constitution was announced on 15 May 2015.

After the constitution was announced, Clevedon Town of Division One South & West were demoted because their floodlights were not to the required standard. As a result, Ware were transferred to Division One Central from Isthmian League Division One North, Fleet Town and Petersfield Town were transferred from Division One South & West to Division One Central, and Burnham, Marlow and newly promoted Flackwell Heath were transferred in the opposite direction.

Flackwell Heath subsequently decided to refuse their promotion and stay in the Hellenic League. Redhill, who had been relegated from Isthmian League Division One South, were offered Flackwell Heath's place, but they refused due to travelling and financial reasons. Their position was then offered to Wessex League runners-up Winchester City, who accepted.

Premier Division
The Premier Division features six new clubs.
 * Bedworth United, promoted as play-off winners of the Division One Central
 * Kettering Town, promoted as champions of the Division One Central
 * King's Lynn Town, transferred from Northern Premier League Premier Division
 * Leamington, relegated from Conference North
 * Merthyr Town, promoted as champions of the Division One South & West
 * Stratford Town, promoted as play-off winners of the Division One South & West

Division One Central
Division One Central features six new clubs.
 * AFC Rushden & Diamonds, promoted as champions of the United Counties League Premier Division.
 * Arlesey Town, relegated from the Premier Division.
 * Fleet Town, transferred from Division One South & West.
 * Kings Langley, promoted from the Spartan South Midlands League Premier Division.
 * Petersfield Town, promoted as champions of the Wessex League Premier Division.
 * Ware, transferred from Isthmian League Division One North.

Division One South & West
Division One South & West features five new clubs.
 * Banbury United, relegated from the Premier Division.
 * Burnham, relegated from the Premier Division.
 * Marlow, transferred from Division One Central.
 * Slimbridge, promoted from the Western League Premier Division.
 * Winchester City, promoted as runners-up in the Wessex League.
 * Flackwell Heath were initially promoted as champions of the Hellenic League Premier Division, but refused promotion after being switched from Division One Central to Division One South & West. Their place eventually went to Winchester City.

League Cup
The Southern League Cup 2015–16 (billed as the RedInsure Cup 2015–16 for sponsorship reasons) is the 78th season of the Southern League Cup, the cup competition of the Southern Football League.