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| Single-Season Innings Pitched Leaderboard | |
| * - Indicates Hall of Fame |
| Rank | Player | Innings Pitched | IP | Year | Career Leaderboard |
| 1. | George Blaeholder | 387.7 | 387.7 | 1931 | |
| 2. | Juan Marichal * | 386.3 | 386.3 | 1968 | |
| 3. | Dizzy Dean * | 380.0 | 380.0 | 1930 | |
| 4. | Juan Marichal * | 379.7 | 379.7 | 1967 | |
| 5. | Warren Spahn * | 379.3 | 379.3 | 1957 | |
| 6. | Ted Lyons | 379.0 | 379.0 | 1930 | |
| 7. | Warren Spahn * | 378.7 | 378.7 | 1953 | |
| 8. | Juan Marichal * | 378.3 | 378.3 | 1963 | |
| Warren Spahn * | 378.3 | 378.3 | 1948 | ||
| 10. | George Winn | 377.7 | 377.7 | 1931 | |
| 11. | Warren Spahn * | 376.7 | 376.7 | 1954 | |
| 12. | Warren Spahn * | 375.7 | 375.7 | 1947 | |
| 13. | Chuck Stobbs * | 375.3 | 375.3 | 1961 | |
| Dizzy Dean * | 375.3 | 375.3 | 1931 | ||
| 15. | Warren Spahn * | 374.7 | 374.7 | 1951 | |
| 16. | Paul Dean * | 374.0 | 374.0 | 1936 | |
| 17. | Vic Aldridge | 373.0 | 373.0 | 1930 | |
| 18. | Warren Spahn * | 371.0 | 371.0 | 1952 | |
| Ted Lyons | 371.0 | 371.0 | 1935 | ||
| 20. | Warren Spahn * | 369.0 | 369.0 | 1950 | |
| 21. | Chuck Stobbs * | 368.0 | 368.0 | 1960 | |
| 22. | Warren Spahn * | 367.7 | 367.7 | 1949 | |
| 23. | Warren Spahn * | 367.7 | 367.7 | 1956 | |
| 24. | Ike Delock | 367.3 | 367.3 | 1965 | |
| 25. | Garland Buckeye | 366.7 | 366.7 | 1931 | |
| Bobo Newsom | 366.7 | 366.7 | 1931 | ||
| 27. | Warren Spahn * | 366.3 | 366.3 | 1958 | |
| Harvey Haddix | 366.3 | 366.3 | 1952 | ||
| Dutch Leonard | 366.3 | 366.3 | 1941 | ||
| Bill Swift * | 366.3 | 366.3 | 1937 | ||
| 31. | Bob Rush | 365.0 | 365.0 | 1954 | |
| Paul Derringer | 365.0 | 365.0 | 1931 | ||
| Ted Lyons | 365.0 | 365.0 | 1931 | ||
| 34. | Bob Friend | 364.7 | 364.7 | 1956 | |
| Dizzy Dean * | 364.7 | 364.7 | 1938 | ||
| 36. | George Winn | 364.3 | 364.3 | 1930 | |
| Bobo Newsom | 364.3 | 364.3 | 1930 | ||
| 38. | Johnny Werts | 364.0 | 364.0 | 1931 | |
| 39. | Chuck Stobbs * | 363.7 | 363.7 | 1958 | |
| 40. | Juan Marichal * | 363.3 | 363.3 | 1966 | |
| 41. | Billy Hoeft | 363.0 | 363.0 | 1963 | |
| 42. | Luis Tiant | 362.7 | 362.7 | 1968 | |
| Juan Marichal * | 362.7 | 362.7 | 1964 | ||
| 44. | Danny Macfayden | 362.3 | 362.3 | 1931 | |
| 45. | Chuck Stobbs * | 362.0 | 362.0 | 1965 | |
| Bob Rush | 362.0 | 362.0 | 1951 | ||
| Dizzy Dean * | 362.0 | 362.0 | 1937 | ||
| Ted Lyons | 362.0 | 362.0 | 1936 | ||
| Ray Benge | 362.0 | 362.0 | 1930 | ||
| 50. | Bob Friend | 361.3 | 361.3 | 1955 | |
| 51. | Bob Friend | 361.0 | 361.0 | 1957 | |
| 52. | Gaylord Perry | 360.7 | 360.7 | 1966 | |
| 53. | Hank Thormahlen | 360.3 | 360.3 | 1930 | |
| 54. | Dizzy Dean * | 359.7 | 359.7 | 1935 | |
| 55. | Danny Macfayden | 359.3 | 359.3 | 1935 | |
| 56. | Chuck Stobbs * | 359.3 | 359.3 | 1957 | |
| Pat Caraway | 359.3 | 359.3 | 1930 | ||
| 58. | Lefty Gomez | 359.0 | 359.0 | 1930 | |
| 59. | Paul Dean * | 358.7 | 358.7 | 1937 | |
| 60. | Juan Marichal * | 358.3 | 358.3 | 1965 | |
| Mort Cooper | 358.3 | 358.3 | 1940 | ||
| 62. | Warren Hacker | 358.0 | 358.0 | 1953 | |
| 63. | Bill Singer | 357.7 | 357.7 | 1966 | |
| 64. | Vito Tamulis | 356.7 | 356.7 | 1944 | |
| Dizzy Dean * | 356.7 | 356.7 | 1940 | ||
| Lefty Gomez | 356.7 | 356.7 | 1931 | ||
| Hod Lisenbee | 356.7 | 356.7 | 1931 | ||
| 68. | Jim Kaat | 356.0 | 356.0 | 1965 | |
| 69. | Dean Chance | 355.7 | 355.7 | 1968 | |
| Bob Rush | 355.7 | 355.7 | 1948 | ||
| 71. | Chuck Stobbs * | 355.3 | 355.3 | 1962 | |
| Danny Macfayden | 355.3 | 355.3 | 1936 | ||
| 73. | Gaylord Perry | 355.0 | 355.0 | 1967 | |
| Bill Swift * | 355.0 | 355.0 | 1938 | ||
| Bill Hallahan | 355.0 | 355.0 | 1931 | ||
| 76. | Dizzy Dean * | 354.7 | 354.7 | 1934 | |
| Johnny Werts | 354.7 | 354.7 | 1930 | ||
| Joe Haynes | 354.7 | 354.7 | 1946 | ||
| 79. | Billy Hoeft | 354.3 | 354.3 | 1966 | |
| Gaylord Perry | 354.3 | 354.3 | 1965 | ||
| 81. | Bill Singer | 353.7 | 353.7 | 1965 | |
| George Blaeholder | 353.7 | 353.7 | 1937 | ||
| Tommy Thomas | 353.7 | 353.7 | 1931 | ||
| Carl Hubbell | 353.7 | 353.7 | 1930 | ||
| 85. | Bob Gibson | 353.0 | 353.0 | 1960 | |
| Bob Logan | 353.0 | 353.0 | 1939 | ||
| 87. | Joe Presko | 352.7 | 352.7 | 1957 | |
| Vic Keen | 352.7 | 352.7 | 1930 | ||
| 89. | Mike Garcia | 352.3 | 352.3 | 1956 | |
| Bob Friend | 352.3 | 352.3 | 1953 | ||
| Mort Cooper | 352.3 | 352.3 | 1942 | ||
| 92. | Dave Wickersham | 352.0 | 352.0 | 1967 | |
| Charley Schanz | 352.0 | 352.0 | 1947 | ||
| Roy Moore | 352.0 | 352.0 | 1935 | ||
| 95. | Joe Moeller * | 351.7 | 351.7 | 1968 | |
| Don Drysdale | 351.7 | 351.7 | 1964 | ||
| Billy Hoeft | 351.7 | 351.7 | 1962 | ||
| George Blaeholder | 351.7 | 351.7 | 1936 | ||
| Roy Mahaffey | 351.7 | 351.7 | 1930 | ||
| 100. | Don Drysdale | 351.3 | 351.3 | 1965 | |
| Dizzy Dean * | 351.3 | 351.3 | 1941 | ||
| Hank Thormahlen | 351.3 | 351.3 | 1931 | ||
| 103. | Jim O'Toole | 351.0 | 351.0 | 1965 | |
| Butch Wensloff | 351.0 | 351.0 | 1943 | ||
| Vito Tamulis | 351.0 | 351.0 | 1941 | ||
| Dizzy Dean * | 351.0 | 351.0 | 1933 | ||
| 107. | Danny Macfayden | 350.7 | 350.7 | 1937 | |
| 108. | Frank Lary | 350.3 | 350.3 | 1956 | |
| 109. | Paul Dean * | 350.0 | 350.0 | 1939 | |
| Whit Wyatt | 350.0 | 350.0 | 1938 | ||
| Ted Lyons | 350.0 | 350.0 | 1932 | ||
| Al Yeargin | 350.0 | 350.0 | 1931 | ||
| George Pipgras | 350.0 | 350.0 | 1931 | ||
| 114. | Gene Conley * | 349.7 | 349.7 | 1961 | |
| Joe Haynes | 349.7 | 349.7 | 1952 | ||
| Rip Sewell | 349.7 | 349.7 | 1935 | ||
| 117. | Hugh Mulcahy | 349.3 | 349.3 | 1941 | |
| 118. | Billy Hoeft | 349.0 | 349.0 | 1965 | |
| Chuck Stobbs * | 349.0 | 349.0 | 1953 | ||
| Denny Galehouse | 349.0 | 349.0 | 1938 | ||
| 121. | Warren Spahn * | 348.7 | 348.7 | 1955 | |
| 122. | Paul Foytack | 348.3 | 348.3 | 1957 | |
| Pat Caraway | 348.3 | 348.3 | 1931 | ||
| Roy Moore | 348.3 | 348.3 | 1931 | ||
| 125. | Bill Singer | 348.0 | 348.0 | 1968 | |
| Ike Delock | 348.0 | 348.0 | 1958 | ||
| Tommy Bridges | 348.0 | 348.0 | 1930 | ||
| 128. | Gene Conley * | 347.7 | 347.7 | 1967 | |
| Frank Lary | 347.7 | 347.7 | 1955 | ||
| Joe Haynes | 347.7 | 347.7 | 1942 | ||
| George Pipgras | 347.7 | 347.7 | 1930 | ||
| 132. | Lefty Gomez | 347.3 | 347.3 | 1936 | |
| 133. | Phil Niekro | 347.0 | 347.0 | 1968 | |
| Bob Logan | 347.0 | 347.0 | 1938 | ||
| 135. | Bob Friend | 346.7 | 346.7 | 1954 | |
| Max Lanier | 346.7 | 346.7 | 1942 | ||
| Danny Macfayden | 346.7 | 346.7 | 1932 | ||
| 138. | Ken Johnson | 346.3 | 346.3 | 1960 | |
| Bob Friend | 346.3 | 346.3 | 1959 | ||
| Danny Macfayden | 346.3 | 346.3 | 1933 | ||
| 141. | Gene Conley * | 346.0 | 346.0 | 1965 | |
| Bob Friend | 346.0 | 346.0 | 1961 | ||
| Ike Delock | 346.0 | 346.0 | 1960 | ||
| 144. | Lou Brissie | 345.7 | 345.7 | 1951 | |
| Bump Hadley | 345.7 | 345.7 | 1938 | ||
| Dutch Leonard | 345.7 | 345.7 | 1939 | ||
| 147. | Dizzy Dean * | 345.3 | 345.3 | 1932 | |
| 148. | Billy Hoeft | 345.0 | 345.0 | 1964 | |
| Curt Simmons | 345.0 | 345.0 | 1962 | ||
| Joe Haynes | 345.0 | 345.0 | 1943 | ||
| Paul Dean * | 345.0 | 345.0 | 1935 | ||
| Ted Lyons | 345.0 | 345.0 | 1934 | ||
| 153. | Ray Herbert | 344.7 | 344.7 | 1954 | |
| Sheriff Blake | 344.7 | 344.7 | 1930 | ||
| 155. | Ken Johnson | 344.3 | 344.3 | 1959 | |
| Lefty Grove | 344.3 | 344.3 | 1930 | ||
| 157. | Van Mungo | 344.0 | 344.0 | 1937 | |
| Fred Hutchinson | 344.0 | 344.0 | 1951 | ||
| Claude Passeau | 344.0 | 344.0 | 1937 | ||
| 160. | Gene Conley * | 343.7 | 343.7 | 1962 | |
| Carl Scheib | 343.7 | 343.7 | 1957 | ||
| Bob Rush | 343.7 | 343.7 | 1952 | ||
| Walt Masterson | 343.7 | 343.7 | 1945 | ||
| Johnny Allen | 343.7 | 343.7 | 1934 | ||
| Red Shea | 343.7 | 343.7 | 1930 | ||
| 166. | Joe Haynes | 343.0 | 343.0 | 1944 | |
| Al Milnar | 343.0 | 343.0 | 1939 | ||
| Roy Moore | 343.0 | 343.0 | 1930 | ||
| 169. | Bob Friend | 342.7 | 342.7 | 1963 | |
| Warren Spahn * | 342.7 | 342.7 | 1960 | ||
| Johnny Rigney | 342.7 | 342.7 | 1938 | ||
| 172. | Rollie Sheldon | 342.3 | 342.3 | 1968 | |
| Jim Palmer | 342.3 | 342.3 | 1968 | ||
| Gene Conley * | 342.3 | 342.3 | 1958 | ||
| Ike Delock | 342.3 | 342.3 | 1957 | ||
| Dave Keefe | 342.3 | 342.3 | 1931 | ||
| 177. | Joey Jay | 342.0 | 342.0 | 1963 | |
| Cy Blanton | 342.0 | 342.0 | 1935 | ||
| 179. | Joe Moeller * | 341.7 | 341.7 | 1964 | |
| Earl Johnson * | 341.7 | 341.7 | 1950 | ||
| Ralph Birkofer | 341.7 | 341.7 | 1936 | ||
| Whit Wyatt | 341.7 | 341.7 | 1931 | ||
| Jim Weaver | 341.7 | 341.7 | 1930 | ||
| 184. | Carl Scheib | 341.3 | 341.3 | 1959 | |
| Marius Russo | 341.3 | 341.3 | 1940 | ||
| 186. | Bucky Jacobs | 341.0 | 341.0 | 1944 | |
| Garland Buckeye | 341.0 | 341.0 | 1932 | ||
| 188. | Jim O'Toole | 340.7 | 340.7 | 1962 | |
| Frank Shellenback | 340.7 | 340.7 | 1931 | ||
| Jumbo Elliott | 340.7 | 340.7 | 1930 | ||
| Fred Frankhouse | 340.7 | 340.7 | 1930 | ||
| 192. | Bob Gibson | 340.3 | 340.3 | 1962 | |
| Joe Presko | 340.3 | 340.3 | 1960 | ||
| Dave Keefe | 340.3 | 340.3 | 1930 | ||
| 195. | Chuck Stobbs * | 340.0 | 340.0 | 1964 | |
| Jim Maloney | 340.0 | 340.0 | 1962 | ||
| Ike Delock | 340.0 | 340.0 | 1956 | ||
| Denny Galehouse | 340.0 | 340.0 | 1937 | ||
| 199. | Curt Simmons | 339.7 | 339.7 | 1954 | |
| Robin Roberts | 339.7 | 339.7 | 1951 | ||
| 201. | Johnny Allen | 339.0 | 339.0 | 1936 | |
| Bill Hallahan | 339.0 | 339.0 | 1930 | ||
| 203. | Pat Malone | 338.7 | 338.7 | 1936 | |
| 204. | Dizzy Trout | 338.3 | 338.3 | 1940 | |
| Monte Pearson | 338.3 | 338.3 | 1940 | ||
| Larry French | 338.3 | 338.3 | 1937 | ||
| Rip Sewell | 338.3 | 338.3 | 1937 | ||
| Dizzy Dean * | 338.3 | 338.3 | 1943 | ||
| 209. | Paul Foytack | 338.0 | 338.0 | 1956 | |
| Red Embree | 338.0 | 338.0 | 1945 | ||
| Johnny Vander Meer | 338.0 | 338.0 | 1940 | ||
| 212. | Sandy Koufax * | 337.7 | 337.7 | 1962 | |
| Fred Hutchinson | 337.7 | 337.7 | 1944 | ||
| Dutch Leonard | 337.7 | 337.7 | 1938 | ||
| Claude Passeau | 337.7 | 337.7 | 1936 | ||
| Tim McNamara | 337.7 | 337.7 | 1931 | ||
| 217. | Gene Conley * | 337.3 | 337.3 | 1960 | |
| Mel Parnell | 337.3 | 337.3 | 1952 | ||
| Stubby Overmire | 337.3 | 337.3 | 1948 | ||
| Claude Passeau | 337.3 | 337.3 | 1940 | ||
| 221. | Stubby Overmire | 337.0 | 337.0 | 1945 | |
| Claude Passeau | 337.0 | 337.0 | 1939 | ||
| Vic Keen | 337.0 | 337.0 | 1931 | ||
| 224. | Johnny Sain | 336.7 | 336.7 | 1946 | |
| Joe Haynes | 336.7 | 336.7 | 1945 | ||
| Bill Hallahan | 336.7 | 336.7 | 1938 | ||
| Pat Malone | 336.7 | 336.7 | 1931 | ||
| Dan Dugan | 336.7 | 336.7 | 1930 | ||
| 229. | Tony Cloninger | 336.3 | 336.3 | 1965 | |
| Paul Foytack | 336.3 | 336.3 | 1964 | ||
| 231. | Dick Donovan | 336.0 | 336.0 | 1950 | |
| Cal McLish | 336.0 | 336.0 | 1949 | ||
| Preacher Roe | 336.0 | 336.0 | 1946 | ||
| Mort Cooper | 336.0 | 336.0 | 1943 | ||
| Jack Hallett | 336.0 | 336.0 | 1942 | ||
| Hugh Mulcahy | 336.0 | 336.0 | 1942 | ||
| Russ Bauers | 336.0 | 336.0 | 1940 | ||
| Lefty Grove | 336.0 | 336.0 | 1937 | ||
| Johnny Rigney | 336.0 | 336.0 | 1937 | ||
| Hod Lisenbee | 336.0 | 336.0 | 1930 | ||
| 241. | Paul Toth | 335.7 | 335.7 | 1962 | |
| Johnny Antonelli | 335.7 | 335.7 | 1957 | ||
| Bob Logan | 335.7 | 335.7 | 1940 | ||
| Mort Cooper | 335.7 | 335.7 | 1939 | ||
| 245. | Jim O'Toole | 335.3 | 335.3 | 1966 | |
| Bob Rush | 335.3 | 335.3 | 1950 | ||
| Dutch Leonard | 335.3 | 335.3 | 1940 | ||
| Harry Gumbert | 335.3 | 335.3 | 1937 | ||
| Wes Ferrell | 335.3 | 335.3 | 1931 | ||
| 250. | Gene Conley * | 335.0 | 335.0 | 1959 | |
| Joe Presko | 335.0 | 335.0 | 1956 | ||
| Bob Logan | 335.0 | 335.0 | 1942 | ||
| Pat Malone | 335.0 | 335.0 | 1938 | ||
| George Blaeholder | 335.0 | 335.0 | 1934 | ||
| Tony Kaufmann | 335.0 | 335.0 | 1932 | ||
| Bobo Newsom | 335.0 | 335.0 | 1932 | ||
| Tommy Thomas | 335.0 | 335.0 | 1930 | ||
| 258. | Carl Scheib | 334.7 | 334.7 | 1960 | |
| Bob Chipman | 334.7 | 334.7 | 1950 | ||
| Joe Haynes | 334.7 | 334.7 | 1948 | ||
| Ken Heintzelman | 334.7 | 334.7 | 1942 | ||
| Ken Raffensberger | 334.7 | 334.7 | 1942 | ||
| Ralph Birkofer | 334.7 | 334.7 | 1940 | ||
| Spud Chandler | 334.7 | 334.7 | 1938 | ||
| Cy Blanton | 334.7 | 334.7 | 1937 | ||
| Garland Buckeye | 334.7 | 334.7 | 1933 | ||
| George Blaeholder | 334.7 | 334.7 | 1932 | ||
| Dutch Henry | 334.7 | 334.7 | 1930 | ||
| 269. | Gene Conley * | 334.3 | 334.3 | 1963 | |
| Ken Johnson | 334.3 | 334.3 | 1962 | ||
| Dutch Leonard | 334.3 | 334.3 | 1936 | ||
| Ivy Andrews | 334.3 | 334.3 | 1934 | ||
| Ted Lyons | 334.3 | 334.3 | 1933 | ||
| 274. | Ralph Terry | 334.0 | 334.0 | 1965 | |
| Harvey Haddix | 334.0 | 334.0 | 1958 | ||
| Ernie White | 334.0 | 334.0 | 1949 | ||
| Rip Sewell | 334.0 | 334.0 | 1936 | ||
| 278. | Willis Hudlin | 333.7 | 333.7 | 1930 | |
| 279. | Joe Nuxhall | 333.3 | 333.3 | 1949 | |
| 280. | Don Drysdale | 333.3 | 333.3 | 1963 | |
| Dick Donovan | 333.3 | 333.3 | 1954 | ||
| Carl Scheib | 333.3 | 333.3 | 1954 | ||
| Johnny Sain | 333.3 | 333.3 | 1949 | ||
| Mort Cooper | 333.3 | 333.3 | 1944 | ||
| Jack Hallett | 333.3 | 333.3 | 1941 | ||
| Pat Malone | 333.3 | 333.3 | 1935 | ||
| Lefty Grove | 333.3 | 333.3 | 1934 | ||
| Wilcy Moore | 333.3 | 333.3 | 1930 | ||
| 289. | Tommy John | 333.0 | 333.0 | 1964 | |
| Chuck Stobbs * | 333.0 | 333.0 | 1955 | ||
| Cliff Fannin | 333.0 | 333.0 | 1949 | ||
| Charley Schanz | 333.0 | 333.0 | 1948 | ||
| Russ Bauers | 333.0 | 333.0 | 1947 | ||
| Cliff Melton * | 333.0 | 333.0 | 1945 | ||
| Bob Logan | 333.0 | 333.0 | 1941 | ||
| Preacher Roe | 333.0 | 333.0 | 1938 | ||
| George Winn | 333.0 | 333.0 | 1932 | ||
| 298. | Joe Moeller * | 332.7 | 332.7 | 1966 | |
| Paul Foytack | 332.7 | 332.7 | 1965 | ||
| Milt Pappas | 332.7 | 332.7 | 1963 |
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