List of players with the lowest earned run average for the 1904 baseball season
| Rank | Player Name | ERA |
| 1 | Addie Joss | 1.59 |
| 2 | Joe McGinnity | 1.61 |
| 3 | Rube Waddell | 1.62 |
| 4 | Ned Garvin | 1.72 |
| 5 | Doc White | 1.78 |
| 6 | Jack Chesbro | 1.82 |
| 7 | Mordecai Brown | 1.86 |
| 8 | Jake Weimer | 1.91 |
| 9 | Frank Owen | 1.94 |
| 10 | Cy Young | 1.97 |
| 11 | Kid Nichols | 2.02 |
| 12 | Christy Mathewson | 2.03 |
| 13 | Jesse Tannehill | 2.04 |
| 14 | Buttons Briggs | 2.05 |
| 14 | Patsy Flaherty | 2.05 |
| 16 | Noodles Hahn | 2.06 |
| 17 | Frank Smith | 2.09 |
| 17 | Mike O'Neill | 2.09 |
| 19 | Bill Bernhard | 2.13 |
| 20 | Sam Leever | 2.17 |
| 20 | Eddie Plank | 2.17 |
| 22 | Harry Howell | 2.19 |
| 23 | Bill Dinneen | 2.20 |
| 24 | Norwood Gibson | 2.21 |
| 25 | Jack Taylor | 2.22 |
