List of Major League Baseball career innings pitched leaders
In baseball, innings pitched are the number of innings a pitcher has completed, measured by the number of batters and baserunners that are put out while the pitcher is on the pitching mound in a game. Three outs made is equal to one inning pitched. One out counts as one-third of an inning, and two outs counts as two-thirds of an inning.
This is a list of the top 100 Major League Baseball pitchers who have accumulated the most innings pitched of all time.
Cy Young is the all-time leader in innings pitched with 7,356, and the only pitcher to throw more than 7,000 innings. Pud Gavin is the only other pitcher in MLB history to throw more than 6,000 innings.
Key
List
| Rank | Player | IP |
| 1 | Cy Young * | 7,356 |
| 2 | Pud Galvin * | 6,003.1 |
| 3 | Walter Johnson * | 5,914.1 |
| 4 | Phil Niekro * | 5,404 |
| 5 | Nolan Ryan * | 5,386 |
| 6 | Gaylord Perry * | 5,350 |
| 7 | Don Sutton * | 5,282.1 |
| 8 | Warren Spahn * | 5,243.2 |
| 9 | Steve Carlton * | 5,217.2 |
| 10 | Grover Cleveland Alexander * | 5,190 |
| 11 | Kid Nichols * | 5,067.1 |
| 12 | Tim Keefe * | 5,049.2 |
| 13 | Greg Maddux * | 5,008.1 |
| 14 | Bert Blyleven * | 4,970 |
| 15 | Bobby Mathews | 4,956 |
| 16 | Roger Clemens | 4,916.2 |
| 17 | Mickey Welch * | 4,802 |
| 18 | Christy Mathewson * | 4,788.2 |
| 19 | Tom Seaver * | 4,783 |
| 20 | Tommy John | 4,710.1 |
| 21 | Robin Roberts * | 4,688.2 |
| 22 | Early Wynn * | 4,564 |
| 23 | John Clarkson * | 4,536.1 |
| 24 | Tony Mullane | 4,531.1 |
| 25 | Jim Kaat | 4,530.1 |
| 26 | Charles Radbourn * | 4,527.1 |
| 27 | Ferguson Jenkins * | 4,500.2 |
| 28 | Eddie Plank * | 4,495.2 |
| 29 | Eppa Rixey * | 4,494.2 |
| 30 | Tom Glavine * | 4,413.1 |
| 31 | Jack Powell | 4,389 |
| 32 | Red Ruffing * | 4,344 |
| 33 | Gus Weyhing | 4,337 |
| 34 | Jim McCormick | 4,275.2 |
| 35 | Frank Tanana | 4,188.1 |
| 36 | Burleigh Grimes * | 4,180 |
| 37 | Ted Lyons * | 4,161 |
| 38 | Randy Johnson * | 4,135.1 |
| 39 | Red Faber * | 4,086.2 |
| 40 | Jamie Moyer | 4,074 |
| 41 | Dennis Martínez | 3,999.2 |
| 42 | Vic Willis * | 3,996 |
| 43 | Jim Palmer * | 3,948 |
| 44 | Lefty Grove * | 3,940.2 |
| 45 | Jack Quinn | 3,920.1 |
| 46 | Bob Gibson * | 3,884.1 |
| 47 | Sad Sam Jones | 3,883 |
| 48 | Jerry Koosman | 3,839.1 |
| 49 | Bob Feller * | 3,827 |
| 50 | Jack Morris * | 3,824 |