The history of the formation of the oldest football clubs is of interest to sport historians in tracing the origins of the modern codes of football from casual pastime to early organised competition and mainstream sport. The identity of the first or oldest football clubs in the world, or even in a particular country, is often disputed or claimed by several clubs, across several codes of football.
Early rugby clubs also referred to themselves, or continue to refer to themselves, as simply a "football club", or as a "rugby football club". "Club" has always meant an independent entity and, during the historical period in question, very few high school or university teams were independent of the educational institutions concerned. Consequently, school and university football teams were seldom referred to as "clubs". That has always been the case, for example, in American football, which has always had ties to college sport in general. Conversely, however, the oldest still-existing "football club" with a well-documented, continuous history is Dublin University Football Club, a rugby union club founded in 1854 at Trinity College, Dublin, Ireland, although there exists some record of Guy's Hospital Football Club being founded in 1843.
While the first clubs emerged in Britain, possibly, as early as the fifteenth century, these are poorly-documented and defunct. For example, the records of the Brewers' Company of London between 1421 and 1423 mention the hiring out of their hall "by the "football players" for "20 pence", under the heading "Trades and Fraternities". The listing of football players as a "fraternity" or a group of players meeting socially under this identity is the earliest allusion to what might be considered a football club. Other early sporting bodies dedicated to playing football include "The Gymnastic Society" of London which met regularly during the second half of the eighteenth century to pursue two sports: football and wrestling The club played its matches – for example between London-based natives of Cumberland and Westmorland – at the Kennington Common from well before 1789 until about 1800.