| 2012 NL Leaders | |||||||||||||||||
| Name | Age | Team | G | W | L | IP | TBF | H | 2B | 3B | HR | R | ER | BB | SO | ERA | RA9 |
| Gio Gonzalez | 27 | Washington | 32 | 21 | 8 | 199.1 | 822 | 149 | 35 | 3 | 9 | 69 | 64 | 76 | 207 | 2.89 | 3.12 |
| R.A. Dickey | 38 | NY Mets | 34 | 20 | 6 | 233.2 | 927 | 192 | 35 | 4 | 24 | 78 | 71 | 54 | 230 | 2.73 | 3.00 |
| Johnny Cueto | 26 | Cincinnati | 33 | 19 | 9 | 217.0 | 888 | 205 | 36 | 6 | 15 | 73 | 67 | 49 | 170 | 2.78 | 3.03 |
| Lance Lynn | 25 | St. Louis | 35 | 18 | 7 | 176.0 | 744 | 168 | 36 | 7 | 16 | 76 | 74 | 64 | 180 | 3.78 | 3.89 |
| Cole Hamels | 29 | Philadelphia | 31 | 17 | 6 | 215.1 | 867 | 191 | 32 | 4 | 24 | 80 | 74 | 52 | 216 | 3.09 | 3.34 |
| Wade Miley | Arizona | 32 | 16 | 11 | 194.2 | 807 | 193 | 46 | 9 | 14 | 79 | 72 | 37 | 144 | 3.33 | 3.65 | |
| Kyle Lohse | 34 | St. Louis | 33 | 16 | 3 | 211.0 | 864 | 192 | 41 | 3 | 19 | 74 | 67 | 38 | 143 | 2.86 | 3.16 |
| Tim Hudson | 37 | Atlanta | 28 | 16 | 7 | 179.0 | 749 | 169 | 29 | 6 | 12 | 77 | 72 | 48 | 102 | 3.62 | 3.87 |
| Madison Bumgarner | 23 | San Francisco | 32 | 16 | 11 | 208.1 | 849 | 182 | 35 | 7 | 23 | 87 | 78 | 49 | 191 | 3.37 | 3.76 |
| Matt Cain | 28 | San Francisco | 32 | 16 | 5 | 219.1 | 876 | 177 | 41 | 3 | 21 | 73 | 68 | 51 | 193 | 2.79 | 3.00 |
| Yovani Gallardo | 26 | Milwaukee | 33 | 16 | 9 | 204.0 | 860 | 185 | 30 | 3 | 26 | 86 | 83 | 81 | 204 | 3.66 | 3.79 |
| A.J. Burnett | 36 | Pittsburgh | 31 | 16 | 10 | 202.1 | 851 | 189 | 30 | 2 | 18 | 86 | 79 | 62 | 180 | 3.51 | 3.83 |
| Barry Zito | 34 | San Francisco | 32 | 15 | 8 | 184.1 | 799 | 186 | 43 | 6 | 20 | 91 | 85 | 70 | 114 | 4.15 | 4.44 |
| Ian Kennedy | 28 | Arizona | 33 | 15 | 12 | 208.1 | 899 | 216 | 50 | 9 | 28 | 101 | 93 | 55 | 187 | 4.02 | 4.36 |
| Stephen Strasburg | Washington | 28 | 15 | 6 | 159.1 | 653 | 136 | 25 | 3 | 15 | 62 | 56 | 48 | 197 | 3.16 | 3.50 | |
| Clayton Richard | 29 | San Diego | 33 | 14 | 14 | 218.2 | 910 | 227 | 44 | 3 | 31 | 110 | 97 | 42 | 107 | 3.99 | 4.53 |
| Matthew Latos | 25 | Cincinnati | 33 | 14 | 4 | 209.1 | 858 | 179 | 41 | 4 | 25 | 87 | 81 | 64 | 185 | 3.48 | 3.74 |
| Ryan Vogelsong | 35 | San Francisco | 31 | 14 | 9 | 189.2 | 788 | 171 | 38 | 4 | 17 | 76 | 71 | 62 | 158 | 3.37 | 3.61 |
| Clayton Kershaw | 24 | LA Dodgers | 33 | 14 | 9 | 227.2 | 901 | 170 | 38 | 3 | 16 | 70 | 64 | 63 | 229 | 2.53 | 2.77 |
| Adam Wainwright | 31 | St. Louis | 32 | 14 | 13 | 198.2 | 831 | 196 | 40 | 8 | 15 | 96 | 87 | 52 | 184 | 3.94 | 4.35 |
| Jake Westbrook | 35 | St. Louis | 28 | 13 | 11 | 174.2 | 751 | 190 | 32 | 3 | 12 | 85 | 76 | 52 | 106 | 3.92 | 4.38 |
| Homer Bailey | 26 | Cincinnati | 33 | 13 | 10 | 208.0 | 874 | 205 | 29 | 9 | 26 | 97 | 85 | 52 | 168 | 3.68 | 4.20 |
| Paul Maholm | 30 | Atlanta | 11 | 13 | 11 | 68.2 | 283 | 63 | 15 | 2 | 8 | 29 | 27 | 19 | 59 | 3.54 | 3.80 |
| Jonathon Niese | 26 | NY Mets | 30 | 13 | 9 | 190.1 | 788 | 174 | 29 | 0 | 22 | 77 | 72 | 49 | 155 | 3.40 | 3.64 |
| 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 |
| Jordan Zimmermann | Washington | 32 | 12 | 8 | 195.2 | 805 | 186 | 42 | 3 | 18 | 69 | 64 | 43 | 153 | 2.94 | 3.17 | |
| Kevin Correia | 32 | Pittsburgh | 32 | 12 | 11 | 171.0 | 728 | 176 | 29 | 5 | 20 | 89 | 80 | 46 | 89 | 4.21 | 4.68 |
| James McDonald | 28 | Pittsburgh | 30 | 12 | 8 | 171.0 | 713 | 147 | 35 | 5 | 21 | 85 | 80 | 69 | 151 | 4.21 | 4.47 |
| Wandy Rodriguez | 34 | Pittsburgh | 13 | 12 | 13 | 75.0 | 317 | 71 | 9 | 1 | 8 | 33 | 31 | 24 | 50 | 3.72 | 3.96 |
