The 1919–20 season was the 23rd in the history of the Western Football League in South West England.
This was the first season after the end of World War I, which had halted all organised football in the United Kingdom for several years.
A number of new clubs joined the league and a second division was formed.
Division One consisted of ten clubs: Bath City, Bristol Rovers Reserves and Welton Rovers, plus seven new clubs:
Division Two consisted of eight clubs: Paulton Rovers, Peasedown St John, Street and Trowbridge Town, plus four new clubs: