The 1925 New South Wales Rugby Football League premiership was the eighteenth season of Sydney’s top-level rugby league club competition, Australia’s first.

Nine teams from across the city contested during the season, with South Sydney being crowned premiers by finishing on top of the League.

[1] For this season the St George Dragons found a permanent homeground at Earl Park, Arncliffe.

The NSWRFL introduced reserve footballs, so that a game could continue even if the ball had been booted out of the stadium.

By Round 13 South Sydney was in such a dominant position (10 points ahead with five rounds to play) that the NSWRFL curtailed the competition and proceeded to the City Cup knockout tournament, which Souths also won.