| 2012 NL Leaders | |||||||||||||||||
| Name | Age | Team | G | W | L | IP | TBF | H | 2B | 3B | HR | R | ER | BB | SO | ERA | RA9 |
| Tim Lincecum | 28 | San Francisco | 33 | 10 | 15 | 186.0 | 825 | 183 | 42 | 5 | 23 | 111 | 107 | 90 | 190 | 5.18 | 5.37 |
| 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 |
| Mike Leake | Cincinnati | 30 | 8 | 9 | 179.0 | 757 | 200 | 46 | 5 | 26 | 97 | 91 | 41 | 116 | 4.58 | 4.88 | |
| Randy Wolf | 36 | Milwaukee | 25 | 3 | 10 | 142.1 | 633 | 179 | 38 | 6 | 21 | 94 | 90 | 45 | 96 | 5.69 | 5.94 |
| Bud Norris | 27 | Houston | 29 | 7 | 13 | 168.1 | 733 | 165 | 37 | 2 | 23 | 90 | 88 | 66 | 165 | 4.71 | 4.81 |
| Thomas Hanson | 26 | Atlanta | 31 | 13 | 10 | 174.2 | 761 | 183 | 45 | 2 | 27 | 95 | 87 | 71 | 161 | 4.48 | 4.89 |
| Adam Wainwright | 31 | St. Louis | 32 | 14 | 13 | 198.2 | 831 | 196 | 40 | 8 | 15 | 96 | 87 | 52 | 184 | 3.94 | 4.35 |
| Barry Zito | 34 | San Francisco | 32 | 15 | 8 | 184.1 | 799 | 186 | 43 | 6 | 20 | 91 | 85 | 70 | 114 | 4.15 | 4.44 |
| Homer Bailey | 26 | Cincinnati | 33 | 13 | 10 | 208.0 | 874 | 205 | 29 | 9 | 26 | 97 | 85 | 52 | 168 | 3.68 | 4.20 |
| Edwin Jackson | 29 | Washington | 31 | 10 | 11 | 189.2 | 790 | 173 | 42 | 8 | 23 | 90 | 85 | 58 | 168 | 4.03 | 4.27 |
| Bronson Arroyo | 35 | Cincinnati | 32 | 12 | 10 | 202.0 | 835 | 209 | 42 | 0 | 26 | 86 | 84 | 35 | 129 | 3.74 | 3.83 |
| Trevor Cahill | 24 | Arizona | 32 | 13 | 12 | 200.0 | 839 | 184 | 38 | 5 | 16 | 93 | 84 | 74 | 156 | 3.78 | 4.19 |
| Edinson Volquez | 29 | San Diego | 32 | 11 | 11 | 182.2 | 802 | 160 | 35 | 4 | 14 | 88 | 83 | 105 | 174 | 4.09 | 4.34 |
| Yovani Gallardo | 26 | Milwaukee | 33 | 16 | 9 | 204.0 | 860 | 185 | 30 | 3 | 26 | 86 | 83 | 81 | 204 | 3.66 | 3.79 |
| Mike Minor | Atlanta | 30 | 11 | 10 | 179.1 | 728 | 151 | 30 | 3 | 26 | 88 | 82 | 56 | 145 | 4.12 | 4.42 | |
| Lucas Harrell | 27 | Houston | 32 | 11 | 11 | 193.2 | 827 | 185 | 27 | 7 | 13 | 90 | 81 | 78 | 140 | 3.76 | 4.18 |
| Matthew Latos | 25 | Cincinnati | 33 | 14 | 4 | 209.1 | 858 | 179 | 41 | 4 | 25 | 87 | 81 | 64 | 185 | 3.48 | 3.74 |
| 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 |
| Chris Capuano | 34 | LA Dodgers | 33 | 12 | 12 | 198.1 | 817 | 187 | 33 | 4 | 25 | 91 | 80 | 54 | 162 | 3.63 | 4.13 |
| Jordan Lyles | 22 | Houston | 25 | 5 | 12 | 141.1 | 628 | 159 | 26 | 3 | 20 | 97 | 80 | 42 | 99 | 5.09 | 6.18 |
| A.J. Burnett | 36 | Pittsburgh | 31 | 16 | 10 | 202.1 | 851 | 189 | 30 | 2 | 18 | 86 | 79 | 62 | 180 | 3.51 | 3.83 |
| Christopher Volstad | 26 | Chi Cubs | 21 | 3 | 12 | 111.1 | 507 | 137 | 21 | 5 | 16 | 81 | 78 | 43 | 61 | 6.31 | 6.55 |
| Roy Halladay | 35 | Philadelphia | 25 | 11 | 8 | 156.1 | 646 | 155 | 27 | 3 | 18 | 78 | 78 | 36 | 132 | 4.49 | 4.49 |
| Madison Bumgarner | 23 | San Francisco | 32 | 16 | 11 | 208.1 | 849 | 182 | 35 | 7 | 23 | 87 | 78 | 49 | 191 | 3.37 | 3.76 |
| Jake Westbrook | 35 | St. Louis | 28 | 13 | 11 | 174.2 | 751 | 190 | 32 | 3 | 12 | 85 | 76 | 52 | 106 | 3.92 | 4.38 |
| Aaron Harang | 34 | LA Dodgers | 31 | 10 | 10 | 179.2 | 786 | 167 | 42 | 4 | 14 | 85 | 75 | 85 | 131 | 3.76 | 4.26 |
| Jeff Samardzija | 28 | Chi Cubs | 28 | 9 | 13 | 174.2 | 723 | 157 | 30 | 6 | 20 | 79 | 74 | 56 | 180 | 3.81 | 4.07 |
| Lance Lynn | 25 | St. Louis | 35 | 18 | 7 | 176.0 | 744 | 168 | 36 | 7 | 16 | 76 | 74 | 64 | 180 | 3.78 | 3.89 |
