2023–24 Isthmian League

The 2023–24 season was the 109th season of the Isthmian League, which is an English football competition featuring semi-professional and amateur clubs from London, East and South East England. The league operates four divisions, the Premier Division at Step 3 and three divisions, North, South Central and South East at Step 4 of the National League System. This was the sixth season since the former South Division was subdivided into the South Central and South East divisions. The league is also known as the Pitching In League under a sponsorship deal with Entain, formerly GVC Holdings.

The allocations for Step 4 this season were announced by The Football Association (FA) on 15 May 2023.

Premier Division
The Premier Division comprised sixteen teams from the previous season, as well as six clubs who newly joined the division.

Team changes
Promoted from the North Division
 * To the Premier Division
 * Hashtag United

Promoted from the South East Division
 * Chatham Town
 * Whitehawk

Relegated from the National League South
 * Cheshunt
 * Concord Rangers
 * Dulwich Hamlet

Promoted to the National League North
 * From the Premier Division
 * Bishop's Stortford

Promoted to the National League South
 * Aveley

Relegated to the North Division
 * Bowers & Pitsea
 * Brightlingsea Regent

Relegated to the South Central Division
 * Corinthian-Casuals

Relegated to the South East Division
 * Herne Bay

North Division
The North Division comprises 20 teams, 14 of which competed in the previous season. This was the first season with play-offs at step five, meaning that just two teams would be relegated from the division.

Team changes
Promoted from the Eastern Counties League
 * To the North Division
 * Ipswich Wanderers

Promoted from the Essex Senior League
 * Enfield
 * Redbridge

Relegated from the Premier Division
 * Bowers & Pitsea
 * Brightlingsea Regent

Transferred from Southern League Division One Central
 * Walthamstow

Promoted to the Southern League Premier Division Central
 * From the North Division
 * AFC Sudbury

Promoted to the Premier Division
 * Hashtag United

Relegated to the Essex Senior League
 * Coggeshall Town
 * Great Wakering Rovers
 * Hullbridge Sports
 * Tilbury

South Central Division
The South Central Division consists of 21 teams, 14 of which competed in the previous campaign. Only two teams would be relegated following the restructuring of the step 4/5 promotion.

Team changes
Promoted from the Combined Counties League Premier Division North
 * To the South Central Division
 * Ascot United

Promoted from the Combined Counties League Premier Division South
 * Badshot Lea
 * Raynes Park Vale

Relegated from the Premier Division
 * Corinthian-Casuals

Relegated from the Southern League Premier Division South
 * Hartley Wintney
 * Metropolitan Police

Promoted to the Southern League Premier Division South
 * From the South Central Division
 * Basingstoke Town
 * Walton & Hersham

Relegated to the Combined Counties Premier Division North
 * Bedfont Sports

Relegated to the Combined Counties Premier Division South
 * Tooting & Mitcham United

Transferred to South East Division
 * Merstham

South East Division
The South East Division consists of 20 teams, 14 of which competed in the previous season. Only two teams would be relegated following the restructuring of the step 4/5 promotion.

Team changes
Promoted from the Southern Combination League
 * To the South East Division
 * Broadbridge Heath

Promoted from the Southern Counties East League
 * Erith & Belvedere
 * Phoenix Sports

Promoted from the Wessex League
 * Horndean

Relegated from the Premier Division
 * Herne Bay

Transferred from South Central Division
 * Merstham

Promoted to the Premier Division
 * From the South East Division
 * Chatham Town
 * Whitehawk

Relegated to the Southern Combination League
 * Haywards Heath Town

Relegated to the Southern Counties East League
 * Corinthian
 * Faversham Town
 * VCD Athletic