| 2012 NL Leaders | |||||||||||||||||
| Name | Age | Team | G | W | L | IP | TBF | H | 2B | 3B | HR | R | ER | BB | SO | ERA | RA9 |
| Edinson Volquez | 29 | San Diego | 32 | 11 | 11 | 182.2 | 802 | 160 | 35 | 4 | 14 | 88 | 83 | 105 | 174 | 4.09 | 4.34 |
| Tim Lincecum | 28 | San Francisco | 33 | 10 | 15 | 186.0 | 825 | 183 | 42 | 5 | 23 | 111 | 107 | 90 | 190 | 5.18 | 5.37 |
| Aaron Harang | 34 | LA Dodgers | 31 | 10 | 10 | 179.2 | 786 | 167 | 42 | 4 | 14 | 85 | 75 | 85 | 131 | 3.76 | 4.26 |
| 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 |
| Gio Gonzalez | 27 | Washington | 32 | 21 | 8 | 199.1 | 822 | 149 | 35 | 3 | 9 | 69 | 64 | 76 | 207 | 2.89 | 3.12 |
| 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 |
| Barry Zito | 34 | San Francisco | 32 | 15 | 8 | 184.1 | 799 | 186 | 43 | 6 | 20 | 91 | 85 | 70 | 114 | 4.15 | 4.44 |
| James McDonald | 28 | Pittsburgh | 30 | 12 | 8 | 171.0 | 713 | 147 | 35 | 5 | 21 | 85 | 80 | 69 | 151 | 4.21 | 4.47 |
| Bud Norris | 27 | Houston | 29 | 7 | 13 | 168.1 | 733 | 165 | 37 | 2 | 23 | 90 | 88 | 66 | 165 | 4.71 | 4.81 |
| Matthew Latos | 25 | Cincinnati | 33 | 14 | 4 | 209.1 | 858 | 179 | 41 | 4 | 25 | 87 | 81 | 64 | 185 | 3.48 | 3.74 |
| Lance Lynn | 25 | St. Louis | 35 | 18 | 7 | 176.0 | 744 | 168 | 36 | 7 | 16 | 76 | 74 | 64 | 180 | 3.78 | 3.89 |
| Clayton Kershaw | 24 | LA Dodgers | 33 | 14 | 9 | 227.2 | 901 | 170 | 38 | 3 | 16 | 70 | 64 | 63 | 229 | 2.53 | 2.77 |
| A.J. Burnett | 36 | Pittsburgh | 31 | 16 | 10 | 202.1 | 851 | 189 | 30 | 2 | 18 | 86 | 79 | 62 | 180 | 3.51 | 3.83 |
| Ryan Vogelsong | 35 | San Francisco | 31 | 14 | 9 | 189.2 | 788 | 171 | 38 | 4 | 17 | 76 | 71 | 62 | 158 | 3.37 | 3.61 |
| Edwin Jackson | 29 | Washington | 31 | 10 | 11 | 189.2 | 790 | 173 | 42 | 8 | 23 | 90 | 85 | 58 | 168 | 4.03 | 4.27 |
| Mike Minor | Atlanta | 30 | 11 | 10 | 179.1 | 728 | 151 | 30 | 3 | 26 | 88 | 82 | 56 | 145 | 4.12 | 4.42 | |
| Jeff Samardzija | 28 | Chi Cubs | 28 | 9 | 13 | 174.2 | 723 | 157 | 30 | 6 | 20 | 79 | 74 | 56 | 180 | 3.81 | 4.07 |
| Erik Bedard | 33 | Pittsburgh | 24 | 7 | 14 | 125.2 | 557 | 129 | 28 | 3 | 14 | 76 | 70 | 56 | 118 | 5.01 | 5.44 |
| Ian Kennedy | 28 | Arizona | 33 | 15 | 12 | 208.1 | 899 | 216 | 50 | 9 | 28 | 101 | 93 | 55 | 187 | 4.02 | 4.36 |
| Chris Capuano | 34 | LA Dodgers | 33 | 12 | 12 | 198.1 | 817 | 187 | 33 | 4 | 25 | 91 | 80 | 54 | 162 | 3.63 | 4.13 |
| Travis Wood | 25 | Chi Cubs | 26 | 6 | 13 | 156.0 | 649 | 133 | 39 | 3 | 25 | 80 | 74 | 54 | 119 | 4.27 | 4.62 |
| R.A. Dickey | 38 | NY Mets | 34 | 20 | 6 | 233.2 | 927 | 192 | 35 | 4 | 24 | 78 | 71 | 54 | 230 | 2.73 | 3.00 |
| Cole Hamels | 29 | Philadelphia | 31 | 17 | 6 | 215.1 | 867 | 191 | 32 | 4 | 24 | 80 | 74 | 52 | 216 | 3.09 | 3.34 |
| Adam Wainwright | 31 | St. Louis | 32 | 14 | 13 | 198.2 | 831 | 196 | 40 | 8 | 15 | 96 | 87 | 52 | 184 | 3.94 | 4.35 |
| Homer Bailey | 26 | Cincinnati | 33 | 13 | 10 | 208.0 | 874 | 205 | 29 | 9 | 26 | 97 | 85 | 52 | 168 | 3.68 | 4.20 |
| Jake Westbrook | 35 | St. Louis | 28 | 13 | 11 | 174.2 | 751 | 190 | 32 | 3 | 12 | 85 | 76 | 52 | 106 | 3.92 | 4.38 |
| Ross Detwiler | 26 | Washington | 33 | 10 | 8 | 164.1 | 686 | 149 | 35 | 2 | 15 | 75 | 62 | 52 | 105 | 3.40 | 4.11 |
| Alex White | Colorado | 23 | 2 | 9 | 98.0 | 459 | 114 | 25 | 6 | 13 | 66 | 60 | 51 | 64 | 5.51 | 6.06 | |
