The Isthmian League is a regional football league covering London and South East England. It is more commonly known by the name of its official title sponsor as the Ryman League, and before that as the Diadora League, ICIS League, Rothmans Isthmian League, Vauxhall-Opel League and Berger Isthmian League.

History

The league was founded in 1905, and was strongly dedicated to amateurism. The champions did not even receive a trophy, league policy being that the honour sufficed. Teams less able to compete financially thus gravitated to it rather than the Southern League, while those with ambition and money would move in the opposite direction.