The Newcastle Australian Football League was an Australian rules football competition in the Hunter region around the city of Newcastle, New South Wales, Australia.
The first clubs (Northumberland, Lambton, Newcastle City, Singleton and Wallsend & Plattsburg) began playing against each other in 1883. Originally known as the Northern District Football Association, the first premiers, Newcastle City, were declared in 1886. However the competition proper began in 1888 with teams contesting for the Black Diamond Cup, now Australia's oldest sporting trophy and was contested in the Black Diamond Australian Football League and continues to be contested in the AFL Hunter Central Coast competition.
In 1894, popularity of Australian rules waned. In 1948, after World War II, a 4 team competition was reborn - the first properly constituted competition in the region. The competing clubs were Waratah, Mayfield, Newcastle City and Broadmeadow.
After the 1999 season, the NAFL merged with the Central Coast AFL to form the Black Diamond Australian Football League.