1992–93 Isthmian League

The 1992–93 season was the 78th season of the Isthmian League, which is an English football competition featuring semi-professional and amateur clubs from London, East and South East England. League consisted of four divisions.

Premier Division
The Premier Division consisted of 22 clubs, including 19 clubs from the previous season and three clubs promoted from Division One:
 * Dulwich Hamlet
 * Stevenage Borough
 * Yeading

No teams were promoted this year after Chesham United and St Albans City were denied due to ground grading.

Division One
Division One consisted of 21 clubs, including 17 clubs from the previous season and four new clubs:
 * Billericay Town, promoted as third in Division Two
 * Bishop's Stortford, relegated from the Premier Division
 * Lewes, promoted as runners-up in Division Two
 * Purfleet, promoted as champions of Division Two

Before the start of the season Leyton-Wingate changed name to Leyton.

Division Two
Division Two consisted of 22 clubs, including 18 clubs from the previous season and four clubs promoted from Division Three:
 * Chertsey Town
 * Edgware Town
 * Hampton
 * Tilbury

Division Three
Division Three consisted of 21 clubs, including 16 clubs from the previous season and five new clubs:
 * Aldershot Town, newly created club
 * East Thurrock United, joined from the Essex Senior League
 * Farnham Town, joined from the Combined Counties League
 * Leighton Town, joined from the South Midlands League
 * Northwood, joined from the Spartan League

Although, Farnham Town were accepted to the league, club never started the season due to ground grading problems and returned to the Combined Counties League for the 1993–94 season.