| Year: | 1904–05 |
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| Font Colour: |
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| League: | NRFU Division 1 |
| League Link: | 1904–05 Northern Rugby Football Union season |
| League Rank: | 12th |
| League Wins: | 9 |
| League Draws: | 1 |
| League Losses: | 24 |
| Points For: | 168 |
| Points Against: | 351 |
| Cup: | Challenge Cup |
| Cup Result: | Second round |
| Cup Wins: | 1 |
| Cup Losses: | 1 |
| List: | yes |
| List Link: | List of St Helens RLFC seasons |
The 1904–05 St Helens R.F.C. season was the club's tenth in the Northern Rugby Football Union, the 31st in the club's sporting history. A year after gaining promotion back to the first division, ST Helens once again struggled, and finished second-bottom to suffer another relegation.[1] St Helens also competed in the end-of-season South West Lancashire mini-league, but could only finish fourth out of six. In the Challenge Cup, St Helens were beaten in the second round by Broughton Red Rose.[2]
| width=20 abbr="Position" | width=175 | Team | width=20 abbr="Played" | Pld | width=20 abbr="Won" | W | width=20 abbr="Drawn" | D | width=20 abbr="Lost" | L | width=20 abbr="Points for" | PF | width=20 abbr="Points against" | PA | width=20 abbr="Points" | Pts | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Oldham | 34 | 25 | 1 | 8 | 291 | 158 | 51 | |||||||||
| 2 | Bradford | 34 | 23 | 2 | 9 | 294 | 156 | 48 | |||||||||
| 3 | Broughton Rangers | 34 | 22 | 2 | 10 | 295 | 175 | 46 | |||||||||
| 4 | Leeds | 34 | 20 | 4 | 10 | 232 | 150 | 44 | |||||||||
| 5 | Warrington | 34 | 20 | 2 | 12 | 220 | 150 | 42 | |||||||||
| 6 | Salford | 34 | 19 | 2 | 13 | 276 | 204 | 40 | |||||||||
| 7 | Wigan | 34 | 18 | 1 | 15 | 230 | 195 | 37 | |||||||||
| 8 | Hull | 34 | 15 | 4 | 15 | 224 | 214 | 34 | |||||||||
| 9 | Hunslet | 34 | 16 | 1 | 17 | 240 | 216 | 33 | |||||||||
| 10 | Halifax | 34 | 15 | 2 | 17 | 204 | 155 | 32 | |||||||||
| 11 | Leigh | 34 | 14 | 3 | 17 | 165 | 209 | 31 | |||||||||
| 12 | Hull Kingston Rovers | 34 | 15 | 0 | 19 | 200 | 220 | 30 | |||||||||
| 13 | Swinton | 34 | 13 | 2 | 19 | 155 | 196 | 28 | |||||||||
| 14 | Wakefield Trinity | 34 | 13 | 2 | 19 | 154 | 211 | 28 | |||||||||
| 15 | Batley | 34 | 12 | 3 | 19 | 160 | 228 | 27 | |||||||||
| 16 | Widnes | 34 | 13 | 1 | 20 | 128 | 280 | 27 | |||||||||
| 17 | St. Helens | 34 | 9 | 1 | 24 | 168 | 351 | 19 | |||||||||
| 18 | Runcorn | 34 | 7 | 1 | 26 | 133 | 301 | 15 | |||||||||