| All-Time Season WAR Leaders | ||||||||||
| RK | PLAYER | YEAR | WAR | OFF | DEF | WAA | TRPG | ORPG | RAA | WAAWP |
| 1 | Pud Galvin | 1884 | 20.5 | 0 | 0 | 16 | 5.2 | 3.1 | 140.6 | 0.7 |
| 2 | Tim Keefe | 1883 | 19.7 | 0 | 0 | 16.7 | 5.6 | 3.2 | 164.9 | 0.7 |
| 3 | Charles Radbourn | 1884 | 19.1 | 0 | 0 | 14.3 | 5.2 | 3.4 | 125 | 0.7 |
| 4 | Jim Devlin | 1876 | 18 | 0 | 0 | 13.4 | 5.7 | 3.7 | 149.1 | 0.7 |
| 5 | John Clarkson | 1889 | 16.7 | 0 | 0 | 11.5 | 5.9 | 4.2 | 116.3 | 0.7 |
| 6 | Guy Hecker | 1884 | 15.5 | 0 | 0 | 12.4 | 5.2 | 3.6 | 97.3 | 0.7 |
| 7 | Charlie Buffinton | 1884 | 14.9 | 0 | 0 | 10.8 | 5.2 | 3.7 | 93.9 | 0.7 |
| John Clarkson | 1887 | 14.9 | 0 | 0 | 10.8 | 6.1 | 4.2 | 97.5 | 0.7 | |
| 9 | Walter Johnson | 1913 | 14.6 | 0 | 0 | 11.5 | 3.9 | 2.1 | 85.1 | 0.7 |
| 10 | Silver King | 1888 | 14.5 | 0 | 0 | 11.8 | 5.3 | 3.5 | 118.2 | 0.7 |
| 11 | Tommy Bond | 1879 | 14.4 | 0 | 0 | 9.8 | 5.1 | 3.6 | 90.1 | 0.7 |
| 12 | Amos Rusie | 1894 | 14.3 | 0 | 0 | 10.4 | 7.6 | 5.1 | 121.6 | 0.7 |
| 13 | Cy Young | 1892 | 14.1 | 0 | 0 | 10.1 | 5.2 | 3.4 | 88.3 | 0.7 |
| 14 | Babe Ruth | 1923 | 14 | 12.2 | 1.2 | 11.5 | 5.5 | 4.8 | 121.2 | 0.6 |
| 15 | Silver King | 1890 | 13.8 | 0 | 0 | 11.2 | 7 | 4.6 | 133.6 | 0.7 |
| Tommy Bond | 1878 | 13.8 | 0 | 0 | 9.9 | 4.8 | 3.3 | 89.8 | 0.7 | |
| 17 | Ed Morris | 1885 | 13.6 | 0 | 0 | 10.9 | 5.4 | 3.7 | 103.9 | 0.7 |
| 18 | Walter Johnson | 1912 | 13.5 | 0 | 0 | 10.1 | 4.5 | 2.8 | 84.9 | 0.7 |
| Charles Radbourn | 1883 | 13.5 | 0 | 0 | 8.3 | 5.7 | 4.5 | 75.5 | 0.6 | |
| 20 | Jim Devlin | 1877 | 13.3 | 0 | 0 | 8.9 | 5.3 | 3.9 | 85.6 | 0.6 |
| 21 | Kid Nichols | 1890 | 13.1 | 0 | 0 | 9.9 | 5.6 | 3.5 | 83.9 | 0.7 |
| John Clarkson | 1885 | 13.1 | 0 | 0 | 7.7 | 5 | 4 | 59.9 | 0.6 | |
| 23 | Babe Ruth | 1921 | 12.9 | 12.2 | -0 | 10.4 | 5.8 | 5.1 | 114.9 | 0.6 |
| 24 | Cy Young | 1901 | 12.6 | 0 | 0 | 9.1 | 5.5 | 3.4 | 83.5 | 0.7 |
| Toad Ramsey | 1886 | 12.6 | 0 | 0 | 9.8 | 5.8 | 4.3 | 97.8 | 0.6 | |
| 26 | Carl Yastrzemski | 1967 | 12.4 | 9.9 | 1.7 | 10.1 | 4.1 | 3.7 | 90 | 0.6 |
| Babe Ruth | 1927 | 12.4 | 11.2 | 0.5 | 9.9 | 5.6 | 5 | 106.3 | 0.6 | |
| 28 | Dwight Gooden | 1985 | 12.2 | 0 | 0 | 9.8 | 4.1 | 1.9 | 77.7 | 0.8 |
| 29 | Pete Alexander | 1920 | 12.1 | 0 | 0 | 9.4 | 3.9 | 2.3 | 72.4 | 0.7 |
| Rogers Hornsby | 1924 | 12.1 | 11.5 | 1.1 | 10.2 | 5.2 | 4.5 | 105 | 0.6 | |
| Charlie Buffinton | 1888 | 12.1 | 0 | 0 | 8.8 | 4.6 | 2.9 | 69.2 | 0.7 | |
| Cy Young | 1895 | 12.1 | 0 | 0 | 8.9 | 6.8 | 4.6 | 93.9 | 0.7 | |
| Steve Carlton | 1972 | 12.1 | 0 | 0 | 9.3 | 3.9 | 2.2 | 75.2 | 0.7 | |
| Mickey Welch | 1884 | 12.1 | 0 | 0 | 8.1 | 5.2 | 4 | 69.8 | 0.6 | |
| 35 | Roger Clemens | 1997 | 11.9 | 0 | 0 | 9.4 | 5 | 2.4 | 86.8 | 0.8 |
| Walter Johnson | 1914 | 11.9 | 0 | 0 | 8.4 | 3.7 | 2.4 | 59.1 | 0.7 | |
| Babe Ruth | 1920 | 11.9 | 11.8 | -0.5 | 9.7 | 5.5 | 4.8 | 102 | 0.6 | |
| Kid Gleason | 1890 | 11.9 | 0 | 0 | 8 | 5.6 | 4.2 | 64.3 | 0.6 | |
| Barry Bonds | 2001 | 11.9 | 12.4 | -1.2 | 9.9 | 5.5 | 4.7 | 105.8 | 0.6 | |
| 40 | Lou Gehrig | 1927 | 11.8 | 11.3 | -0.2 | 9.3 | 5.6 | 5 | 100 | 0.6 |
| Barry Bonds | 2002 | 11.8 | 11.8 | -0.7 | 9.9 | 5.2 | 4.5 | 101.7 | 0.6 | |
| Kid Nichols | 1893 | 11.8 | 0 | 0 | 8.2 | 6.7 | 4.8 | 91.6 | 0.7 | |
| 43 | Cy Young | 1893 | 11.7 | 0 | 0 | 8.1 | 6.7 | 4.9 | 91.4 | 0.7 |
| Babe Ruth | 1924 | 11.7 | 10.8 | 0.2 | 9.3 | 5.6 | 5 | 99.2 | 0.6 | |
| Pedro Martinez | 2000 | 11.7 | 0 | 0 | 9.7 | 5.3 | 2.1 | 93.5 | 0.8 | |
| Wilbur Wood | 1971 | 11.7 | 0 | 0 | 8.6 | 3.9 | 2.4 | 66.6 | 0.7 | |
| 47 | Tony Mullane | 1884 | 11.6 | 0 | 0 | 8.9 | 5.2 | 3.9 | 68.6 | 0.6 |
| Amos Rusie | 1893 | 11.6 | 0 | 0 | 7.5 | 6.7 | 5.1 | 84.1 | 0.6 | |
| Joe McGinnity | 1903 | 11.6 | 0 | 0 | 8.1 | 4.9 | 3.5 | 71.8 | 0.6 | |
| Tommy Bond | 1877 | 11.6 | 0 | 0 | 7.4 | 5.3 | 4.1 | 71.5 | 0.6 | |