| 2012 NL Leaders | |||||||||||||||||
| Name | Age | Team | G | W | L | IP | TBF | H | 2B | 3B | HR | R | ER | BB | SO | ERA | RA9 |
| Clayton Richard | 29 | San Diego | 33 | 14 | 14 | 218.2 | 910 | 227 | 44 | 3 | 31 | 110 | 97 | 42 | 107 | 3.99 | 4.53 |
| Ian Kennedy | 28 | Arizona | 33 | 15 | 12 | 208.1 | 899 | 216 | 50 | 9 | 28 | 101 | 93 | 55 | 187 | 4.02 | 4.36 |
| Bronson Arroyo | 35 | Cincinnati | 32 | 12 | 10 | 202.0 | 835 | 209 | 42 | 0 | 26 | 86 | 84 | 35 | 129 | 3.74 | 3.83 |
| Cliff Lee | 34 | Philadelphia | 30 | 6 | 9 | 211.0 | 847 | 207 | 43 | 3 | 26 | 79 | 74 | 28 | 207 | 3.16 | 3.37 |
| Johnny Cueto | 26 | Cincinnati | 33 | 19 | 9 | 217.0 | 888 | 205 | 36 | 6 | 15 | 73 | 67 | 49 | 170 | 2.78 | 3.03 |
| Homer Bailey | 26 | Cincinnati | 33 | 13 | 10 | 208.0 | 874 | 205 | 29 | 9 | 26 | 97 | 85 | 52 | 168 | 3.68 | 4.20 |
| Mike Leake | Cincinnati | 30 | 8 | 9 | 179.0 | 757 | 200 | 46 | 5 | 26 | 97 | 91 | 41 | 116 | 4.58 | 4.88 | |
| Adam Wainwright | 31 | St. Louis | 32 | 14 | 13 | 198.2 | 831 | 196 | 40 | 8 | 15 | 96 | 87 | 52 | 184 | 3.94 | 4.35 |
| Wade Miley | Arizona | 32 | 16 | 11 | 194.2 | 807 | 193 | 46 | 9 | 14 | 79 | 72 | 37 | 144 | 3.33 | 3.65 | |
| R.A. Dickey | 38 | NY Mets | 34 | 20 | 6 | 233.2 | 927 | 192 | 35 | 4 | 24 | 78 | 71 | 54 | 230 | 2.73 | 3.00 |
| Kyle Lohse | 34 | St. Louis | 33 | 16 | 3 | 211.0 | 864 | 192 | 41 | 3 | 19 | 74 | 67 | 38 | 143 | 2.86 | 3.16 |
| Cole Hamels | 29 | Philadelphia | 31 | 17 | 6 | 215.1 | 867 | 191 | 32 | 4 | 24 | 80 | 74 | 52 | 216 | 3.09 | 3.34 |
| Jake Westbrook | 35 | St. Louis | 28 | 13 | 11 | 174.2 | 751 | 190 | 32 | 3 | 12 | 85 | 76 | 52 | 106 | 3.92 | 4.38 |
| A.J. Burnett | 36 | Pittsburgh | 31 | 16 | 10 | 202.1 | 851 | 189 | 30 | 2 | 18 | 86 | 79 | 62 | 180 | 3.51 | 3.83 |
| Chris Capuano | 34 | LA Dodgers | 33 | 12 | 12 | 198.1 | 817 | 187 | 33 | 4 | 25 | 91 | 80 | 54 | 162 | 3.63 | 4.13 |
| Barry Zito | 34 | San Francisco | 32 | 15 | 8 | 184.1 | 799 | 186 | 43 | 6 | 20 | 91 | 85 | 70 | 114 | 4.15 | 4.44 |
| Jordan Zimmermann | Washington | 32 | 12 | 8 | 195.2 | 805 | 186 | 42 | 3 | 18 | 69 | 64 | 43 | 153 | 2.94 | 3.17 | |
| Yovani Gallardo | 26 | Milwaukee | 33 | 16 | 9 | 204.0 | 860 | 185 | 30 | 3 | 26 | 86 | 83 | 81 | 204 | 3.66 | 3.79 |
| Lucas Harrell | 27 | Houston | 32 | 11 | 11 | 193.2 | 827 | 185 | 27 | 7 | 13 | 90 | 81 | 78 | 140 | 3.76 | 4.18 |
| Trevor Cahill | 24 | Arizona | 32 | 13 | 12 | 200.0 | 839 | 184 | 38 | 5 | 16 | 93 | 84 | 74 | 156 | 3.78 | 4.19 |
| Thomas Hanson | 26 | Atlanta | 31 | 13 | 10 | 174.2 | 761 | 183 | 45 | 2 | 27 | 95 | 87 | 71 | 161 | 4.48 | 4.89 |
| Tim Lincecum | 28 | San Francisco | 33 | 10 | 15 | 186.0 | 825 | 183 | 42 | 5 | 23 | 111 | 107 | 90 | 190 | 5.18 | 5.37 |
| Madison Bumgarner | 23 | San Francisco | 32 | 16 | 11 | 208.1 | 849 | 182 | 35 | 7 | 23 | 87 | 78 | 49 | 191 | 3.37 | 3.76 |
| Matthew Latos | 25 | Cincinnati | 33 | 14 | 4 | 209.1 | 858 | 179 | 41 | 4 | 25 | 87 | 81 | 64 | 185 | 3.48 | 3.74 |
| Randy Wolf | 36 | Milwaukee | 25 | 3 | 10 | 142.1 | 633 | 179 | 38 | 6 | 21 | 94 | 90 | 45 | 96 | 5.69 | 5.94 |
| Matt Cain | 28 | San Francisco | 32 | 16 | 5 | 219.1 | 876 | 177 | 41 | 3 | 21 | 73 | 68 | 51 | 193 | 2.79 | 3.00 |
| Kevin Correia | 32 | Pittsburgh | 32 | 12 | 11 | 171.0 | 728 | 176 | 29 | 5 | 20 | 89 | 80 | 46 | 89 | 4.21 | 4.68 |
| Jonathon Niese | 26 | NY Mets | 30 | 13 | 9 | 190.1 | 788 | 174 | 29 | 0 | 22 | 77 | 72 | 49 | 155 | 3.40 | 3.64 |
| Edwin Jackson | 29 | Washington | 31 | 10 | 11 | 189.2 | 790 | 173 | 42 | 8 | 23 | 90 | 85 | 58 | 168 | 4.03 | 4.27 |
| Ryan Vogelsong | 35 | San Francisco | 31 | 14 | 9 | 189.2 | 788 | 171 | 38 | 4 | 17 | 76 | 71 | 62 | 158 | 3.37 | 3.61 |
