| Year: | 1925 |
| Competition: | New South Wales Rugby Football League |
| Teams: | 9 |
| Count: | 5th |
| Mpcount: | 5th |
| Matches: | 52 |
| Points: | 1197 |
| Top Point Scorer: | Benny Wearing (80) |
| Top Try Scorer: | Benny Wearing (12) |
| Prevseason Link: | 1924 NSWRFL season |
| Prevseason Year: | 1924 |
| Nextseason Link: | 1926 NSWRFL season |
| Nextseason Year: | 1926 |
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.
South Sydney won all their twelve matches during the season, and remain the only club to achieve this in the history of the competition and just one of five to go through a season undefeated. The Rabbitohs made a clean sweep of all three grades.
It was the first of seven premierships South Sydney would win in eight years through to 1932. There were no finals played. 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.
| width=175 | Team | Pld | W | D | L | B | PF | PA | PD | Pts | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | South Sydney | 12 | 12 | 0 | 0 | 1 | 190 | 87 | +103 | 26 | |
| 2 | Western Suburbs | 11 | 6 | 0 | 5 | 2 | 166 | 150 | +16 | 16 | |
| 3 | Balmain | 12 | 6 | 1 | 5 | 1 | 133 | 112 | +21 | 15 | |
| 4 | North Sydney | 12 | 6 | 1 | 5 | 1 | 157 | 138 | +19 | 15 | |
| 5 | St. George | 11 | 5 | 1 | 5 | 2 | 132 | 141 | -9 | 15 | |
| 6 | Glebe | 12 | 5 | 0 | 7 | 1 | 118 | 171 | -53 | 12 | |
| 7 | Sydney University | 11 | 3 | 1 | 7 | 2 | 118 | 142 | -24 | 11 | |
| 8 | Eastern Suburbs | 12 | 4 | 0 | 8 | 1 | 89 | 120 | -31 | 10 | |
| 9 | Newtown | 11 | 3 | 0 | 8 | 2 | 94 | 136 | -42 | 10 |