The Spartan League was an English football league covering London and adjacent counties.

Formed in 1907, the league was along with the Isthmian League and the Athenian League, one of the strong amateur competitions in the South, with three clubs reaching the FA Amateur Cup semi-finals. However, neither Metropolitan Police (in 1933-34), Maidenhead United (1935-36) or Briggs Sports (1953-54) were able to win the Cup.

With membership numbers dropping, in 1975 the league merged with the London League. The new competition was originally called the London Spartan League, but the name reverted to just the Spartan League in 1987.

A further merger came in 1997, when the South Midlands League were the other party, together forming the Spartan South Midlands League.