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| Single-Season Losses Leaderboard | |
| * - Indicates Hall of Fame |
| Rank | Player | Losses | IP | Year | Career Leaderboard |
| 1. | Charley Root | 31 | 310.0 | 1934 | |
| 2. | Tony Cloninger | 29 | 313.7 | 1967 | |
| Bob Trowbridge | 29 | 277.0 | 1957 | ||
| 4. | Bill Singer | 28 | 348.0 | 1968 | |
| Dick Drott | 28 | 305.7 | 1963 | ||
| Bud Daley | 28 | 321.0 | 1961 | ||
| Dick Drott | 28 | 274.7 | 1961 | ||
| Jim Bunning | 28 | 307.0 | 1956 | ||
| Dick Fowler | 28 | 246.3 | 1950 | ||
| 10. | Milt Pappas | 27 | 319.7 | 1968 | |
| Ike Delock | 27 | 308.0 | 1967 | ||
| Bob Gibson | 27 | 307.3 | 1965 | ||
| Camilo Pascual | 27 | 307.3 | 1955 | ||
| Russ Christopher | 27 | 286.7 | 1948 | ||
| Dutch Leonard | 27 | 318.0 | 1937 | ||
| Tex Carleton | 27 | 317.0 | 1936 | ||
| 17. | Clay Carroll | 26 | 242.7 | 1964 | |
| Paul Toth | 26 | 335.7 | 1962 | ||
| Claude Passeau | 26 | 337.3 | 1940 | ||
| Bump Hadley | 26 | 345.7 | 1938 | ||
| Red Shea | 26 | 343.7 | 1930 | ||
| Tommy Thomas | 26 | 335.0 | 1930 | ||
| 23. | Joel Davis | 25 | 211.7 | 1989 | |
| La Marr Hoyt | 25 | 253.0 | 1980 | ||
| Red Swanson | 25 | 294.7 | 1967 | ||
| Bob Friend | 25 | 322.0 | 1966 | ||
| Pedro Ramos | 25 | 325.0 | 1958 | ||
| Ike Delock | 25 | 340.0 | 1956 | ||
| Charley Schanz | 25 | 327.0 | 1955 | ||
| Randy Gumpert | 25 | 289.0 | 1951 | ||
| Red Munger | 25 | 288.7 | 1950 | ||
| Jack Kramer | 25 | 307.3 | 1949 | ||
| Russ Meyer | 25 | 296.0 | 1949 | ||
| Cliff Fannin | 25 | 322.0 | 1948 | ||
| Ken Heintzelman | 25 | 334.7 | 1942 | ||
| Rip Sewell | 25 | 349.7 | 1935 | ||
| Johnny Werts | 25 | 364.0 | 1931 | ||
| Dan Dugan | 25 | 336.7 | 1930 | ||
| Nick Dumovich | 25 | 327.3 | 1930 | ||
| 40. | Scott Anderson | 24 | 214.3 | 1988 | |
| Stan Perzanowski | 24 | 247.7 | 1976 | ||
| Joe Bonikowski | 24 | 300.7 | 1968 | ||
| Paul Foytack | 24 | 265.7 | 1968 | ||
| Jack Fisher | 24 | 309.7 | 1967 | ||
| Paul Foytack | 24 | 268.7 | 1967 | ||
| Bob Bruce | 24 | 321.7 | 1966 | ||
| Dallas Green | 24 | 270.0 | 1966 | ||
| Bill Singer | 24 | 353.7 | 1965 | ||
| Don Kaiser | 24 | 299.0 | 1965 | ||
| Ray Herbert | 24 | 267.3 | 1965 | ||
| Don Larsen | 24 | 292.0 | 1964 | ||
| Ryne Duren | 24 | 221.3 | 1964 | ||
| Bob Anderson | 24 | 275.0 | 1961 | ||
| Ken Johnson | 24 | 344.3 | 1959 | ||
| Orlando Pena | 24 | 237.7 | 1959 | ||
| Ike Delock | 24 | 348.0 | 1958 | ||
| Joey Jay | 24 | 293.0 | 1955 | ||
| Ed Hanyzewski | 24 | 273.3 | 1955 | ||
| Bob Lemon | 24 | 298.3 | 1952 | ||
| Hal Newhouser | 24 | 301.7 | 1950 | ||
| Jim Wilson | 24 | 245.3 | 1948 | ||
| Cal McLish | 24 | 233.0 | 1948 | ||
| John Burrows | 24 | 270.3 | 1943 | ||
| Sam Nahem | 24 | 284.0 | 1942 | ||
| Marius Russo | 24 | 316.3 | 1941 | ||
| Bob Logan | 24 | 353.0 | 1939 | ||
| Al Milnar | 24 | 343.0 | 1939 | ||
| Bill Lohrman | 24 | 290.0 | 1939 | ||
| Ed Durham | 24 | 306.7 | 1936 | ||
| Frank Shellenback | 24 | 340.7 | 1931 | ||
| Red Ruffing | 24 | 312.3 | 1931 | ||
| Lon Warneke | 24 | 305.0 | 1931 | ||
| Sarge Connally | 24 | 302.7 | 1931 | ||
| Larry French | 24 | 275.3 | 1931 | ||
| 75. | Stan Perzanowski | 23 | 261.3 | 1978 | |
| Casey Cox | 23 | 192.0 | 1973 | ||
| Woodie Fryman | 23 | 241.7 | 1971 | ||
| Ron Reed | 23 | 261.7 | 1970 | ||
| Milt Pappas | 23 | 224.3 | 1969 | ||
| Jim Perry | 23 | 295.3 | 1968 | ||
| Steve Carlton * | 23 | 321.0 | 1966 | ||
| Ray Culp | 23 | 324.7 | 1963 | ||
| Ralph Terry | 23 | 326.7 | 1962 | ||
| Bob Humphreys | 23 | 235.3 | 1962 | ||
| Mike Garcia | 23 | 327.0 | 1961 | ||
| Joey Jay | 23 | 321.3 | 1961 | ||
| Paul Foytack | 23 | 321.0 | 1960 | ||
| Ike Delock | 23 | 342.3 | 1957 | ||
| Whitey Ford | 23 | 216.0 | 1957 | ||
| Carl Scheib | 23 | 332.7 | 1953 | ||
| Johnny Sain | 23 | 278.7 | 1953 | ||
| Al Javery | 23 | 254.3 | 1952 | ||
| Chris Van Cuyk | 23 | 284.0 | 1950 | ||
| Max Surkont | 23 | 307.0 | 1949 | ||
| Russ Bauers | 23 | 297.7 | 1949 | ||
| Tom Earley | 23 | 256.0 | 1949 | ||
| Bob Feller | 23 | 255.0 | 1948 | ||
| Hank Wyse | 23 | 317.7 | 1946 | ||
| Tommy Byrne | 23 | 272.0 | 1945 | ||
| Fred Hutchinson | 23 | 337.7 | 1944 | ||
| Larry French | 23 | 282.0 | 1944 | ||
| Butch Wensloff | 23 | 351.0 | 1943 | ||
| Tex Hughson | 23 | 302.0 | 1941 | ||
| Bob Feller | 23 | 327.0 | 1940 | ||
| Dutch Leonard | 23 | 345.7 | 1939 | ||
| Curt Davis | 23 | 326.7 | 1938 | ||
| Ted Lyons | 23 | 285.7 | 1937 | ||
| Johnny Allen | 23 | 339.0 | 1936 | ||
| Rip Sewell | 23 | 334.0 | 1936 | ||
| Curt Davis | 23 | 330.0 | 1936 | ||
| Van Mungo | 23 | 332.3 | 1935 | ||
| Charlie Sullivan | 23 | 280.7 | 1935 | ||
| Bill Hallahan | 23 | 221.0 | 1935 | ||
| Jumbo Elliott | 23 | 297.7 | 1932 | ||
| Al Yeargin | 23 | 350.0 | 1931 | ||
| 116. | Rick Reuschel | 22 | 286.3 | 1986 | |
| Frank Tanana | 22 | 247.0 | 1983 | ||
| Alan Foster | 22 | 234.0 | 1983 | ||
| Pascual Perez | 22 | 258.3 | 1981 | ||
| Paul Moskau | 22 | 226.3 | 1981 | ||
| Dick Selma | 22 | 199.7 | 1980 | ||
| Ken Kravec | 22 | 221.3 | 1979 | ||
| Milt Wilcox | 22 | 296.7 | 1975 | ||
| Frank Linzy | 22 | 205.7 | 1975 | ||
| Carl Morton | 22 | 214.3 | 1973 | ||
| Gene Brabender | 22 | 238.3 | 1968 | ||
| Don Drysdale | 22 | 351.3 | 1965 | ||
| Gaylord Perry | 22 | 319.3 | 1964 | ||
| Red Swanson | 22 | 304.3 | 1964 | ||
| Ray Herbert | 22 | 282.3 | 1964 | ||
| Denny McLain | 22 | 274.0 | 1964 | ||
| Bill Kunkel | 22 | 270.3 | 1964 | ||
| Eddie Fisher | 22 | 314.3 | 1963 | ||
| Eddie Fisher | 22 | 330.3 | 1962 | ||
| Steve Hamilton | 22 | 312.0 | 1962 | ||
| Don Cardwell | 22 | 281.0 | 1962 | ||
| Don Rudolph | 22 | 315.7 | 1961 | ||
| Jim Brewer * | 22 | 283.7 | 1961 | ||
| Gary Peters | 22 | 254.3 | 1960 | ||
| Ralph Terry | 22 | 270.3 | 1959 | ||
| Dick Hyde | 22 | 298.7 | 1957 | ||
| Bob Shaw | 22 | 263.0 | 1957 | ||
| Sam Jones | 22 | 238.0 | 1957 | ||
| Roger Bowman | 22 | 248.3 | 1956 | ||
| Dick Donovan | 22 | 333.3 | 1954 | ||
| Bill Henry | 22 | 304.0 | 1954 | ||
| Harvey Haddix | 22 | 330.3 | 1953 | ||
| Billy Hoeft | 22 | 302.7 | 1953 | ||
| Lou Brissie | 22 | 255.3 | 1952 | ||
| Niles Jordan | 22 | 302.7 | 1951 | ||
| Milo Candini | 22 | 258.3 | 1948 | ||
| Charlie Gassaway | 22 | 286.0 | 1947 | ||
| Murry Dickson | 22 | 278.7 | 1947 | ||
| Hi Bithorn | 22 | 329.7 | 1946 | ||
| Joe Nuxhall | 22 | 270.0 | 1945 | ||
| Paul Erickson | 22 | 292.3 | 1943 | ||
| Rube Melton | 22 | 268.3 | 1943 | ||
| Schoolboy Rowe | 22 | 251.0 | 1943 | ||
| Johnny Vander Meer | 22 | 295.3 | 1942 | ||
| Dizzy Trout | 22 | 338.3 | 1940 | ||
| Lon Warneke | 22 | 296.7 | 1939 | ||
| Ted Olson | 22 | 295.3 | 1939 | ||
| Joe Dobson | 22 | 246.0 | 1939 | ||
| Whitey Wilshere | 22 | 279.3 | 1938 | ||
| Bill Lohrman | 22 | 321.7 | 1936 | ||
| Monte Pearson | 22 | 299.0 | 1936 | ||
| Cy Blanton | 22 | 342.0 | 1935 | ||
| Bump Hadley | 22 | 319.3 | 1935 | ||
| George Pipgras | 22 | 281.3 | 1933 | ||
| Danny Macfayden | 22 | 362.3 | 1931 | ||
| Lefty Gomez | 22 | 356.7 | 1931 | ||
| Jim Weaver | 22 | 312.7 | 1931 | ||
| Roy Mahaffey | 22 | 308.3 | 1931 | ||
| Lefty Grove | 22 | 344.3 | 1930 | ||
| Sarge Connally | 22 | 314.3 | 1930 | ||
| 176. | Greg Maddux | 21 | 214.7 | 1989 | |
| Erik Hanson | 21 | 215.3 | 1988 | ||
| Rick Camp | 21 | 227.3 | 1985 | ||
| Derek Botelho | 21 | 218.0 | 1985 | ||
| John Montefusco | 21 | 280.0 | 1983 | ||
| Steve Fireovid | 21 | 217.7 | 1983 | ||
| Steve Carlton * | 21 | 260.3 | 1982 | ||
| Alan Foster | 21 | 231.7 | 1982 | ||
| Steve McCatty | 21 | 214.3 | 1981 | ||
| Buddy Schultz | 21 | 188.0 | 1977 | ||
| Bill Singer | 21 | 238.3 | 1975 | ||
| Jim Maloney | 21 | 220.3 | 1975 | ||
| Joe Moeller * | 21 | 295.7 | 1974 | ||
| Doug Rau | 21 | 234.3 | 1974 | ||
| Gary Gentry | 21 | 244.7 | 1972 | ||
| Ken Reynolds | 21 | 229.3 | 1972 | ||
| Bob Gibson | 21 | 207.0 | 1972 | ||
| Ed Acosta | 21 | 221.3 | 1970 | ||
| Frank Baumann | 21 | 243.7 | 1969 | ||
| Phil Niekro | 21 | 347.0 | 1968 | ||
| Tony Cloninger | 21 | 326.7 | 1968 | ||
| Cecil Butler | 21 | 315.7 | 1968 | ||
| Tug McGraw | 21 | 313.7 | 1968 | ||
| Fergie Jenkins | 21 | 266.3 | 1968 | ||
| Mike Marshall | 21 | 286.7 | 1967 | ||
| Ike Delock | 21 | 328.0 | 1966 | ||
| John Gelnar | 21 | 304.3 | 1966 | ||
| Fergie Jenkins | 21 | 261.3 | 1966 | ||
| Grant Jackson | 21 | 219.7 | 1966 | ||
| Gaylord Perry | 21 | 354.3 | 1965 | ||
| Gene Conley * | 21 | 346.0 | 1965 | ||
| Jim Lonborg | 21 | 326.3 | 1965 | ||
| Billy McCool | 21 | 246.3 | 1965 | ||
| Humberto Robinson | 21 | 279.3 | 1964 | ||
| Mickey Lolich | 21 | 261.0 | 1964 | ||
| Mickey Lolich | 21 | 264.3 | 1963 | ||
| Fred Green | 21 | 222.7 | 1963 | ||
| Curt Simmons | 21 | 345.0 | 1962 | ||
| Gary Peters | 21 | 307.0 | 1962 | ||
| Ryne Duren | 21 | 206.0 | 1962 | ||
| Don Drysdale | 21 | 298.7 | 1961 | ||
| Dick Donovan | 21 | 255.3 | 1961 | ||
| Mike Garcia | 21 | 329.0 | 1960 | ||
| Bobby Shantz | 21 | 291.7 | 1960 | ||
| Jim Kaat | 21 | 280.3 | 1960 | ||
| John Buzhardt | 21 | 269.0 | 1960 | ||
| Al Jackson | 21 | 264.7 | 1960 | ||
| Ken Lehman | 21 | 276.3 | 1959 | ||
| Luis Arroyo | 21 | 258.7 | 1959 | ||
| Harvey Haddix | 21 | 334.0 | 1958 | ||
| Jim Bunning | 21 | 272.3 | 1958 | ||
| Joey Jay | 21 | 308.3 | 1957 | ||
| Roger Craig | 21 | 307.0 | 1957 | ||
| Howie Pollet | 21 | 304.0 | 1957 | ||
| Don Larsen | 21 | 303.0 | 1957 | ||
| Bobby Shantz | 21 | 257.3 | 1957 | ||
| Camilo Pascual | 21 | 315.7 | 1956 | ||
| Cliff Fannin | 21 | 305.7 | 1956 | ||
| Don Gross | 21 | 241.3 | 1956 | ||
| Johnny Antonelli | 21 | 311.0 | 1955 | ||
| Gus Keriazakos | 21 | 204.7 | 1955 | ||
| Russ Kemmerer | 21 | 269.3 | 1954 | ||
| Ed Hanyzewski | 21 | 190.7 | 1954 | ||
| Ray Scarborough | 21 | 256.3 | 1953 | ||
| Johnny Rigney | 21 | 235.0 | 1952 | ||
| Don Newcombe | 21 | 244.0 | 1950 | ||
| Cliff Fannin | 21 | 333.0 | 1949 | ||
| Red Munger | 21 | 303.7 | 1949 | ||
| Bob Harris | 21 | 289.7 | 1949 | ||
| Ed Hanyzewski | 21 | 281.3 | 1949 | ||
| Russ Bauers | 21 | 333.0 | 1947 | ||
| Bob Chipman | 21 | 321.0 | 1947 | ||
| Gene Schott | 21 | 308.7 | 1947 | ||
| Dave Ferriss | 21 | 313.3 | 1946 | ||
| Gene Schott | 21 | 311.7 | 1946 | ||
| Bob Chipman | 21 | 256.3 | 1946 | ||
| Bob Muncrief | 21 | 331.7 | 1945 | ||
| Ken Raffensberger | 21 | 300.3 | 1944 | ||
| Butch Wensloff | 21 | 289.3 | 1944 | ||
| Tommy Byrne | 21 | 262.7 | 1944 | ||
| Hal Newhouser | 21 | 232.3 | 1944 | ||
| Murry Dickson | 21 | 307.3 | 1943 | ||
| Tiny Bonham | 21 | 253.0 | 1943 | ||
| Marius Russo | 21 | 307.3 | 1942 | ||
| Bobo Newsom | 21 | 286.7 | 1942 | ||
| Dizzy Trout | 21 | 323.7 | 1941 | ||
| Joe Bowman | 21 | 298.3 | 1940 | ||
| Wes Ferrell | 21 | 316.3 | 1939 | ||
| Dizzy Trout | 21 | 247.3 | 1939 | ||
| Bill Swift * | 21 | 355.0 | 1938 | ||
| Harry Gumbert | 21 | 335.3 | 1937 | ||
| Cy Blanton | 21 | 334.7 | 1937 | ||
| Roy Moore | 21 | 261.7 | 1937 | ||
| Ed Heusser | 21 | 329.3 | 1936 | ||
| Cy Blanton | 21 | 308.0 | 1936 | ||
| Pat Malone | 21 | 333.3 | 1935 | ||
| Larry French | 21 | 323.7 | 1934 | ||
| Denny Galehouse | 21 | 308.0 | 1934 | ||
| Lefty Gomez | 21 | 318.7 | 1933 | ||
| Rip Sewell | 21 | 318.3 | 1933 | ||
| Tommy Bridges | 21 | 311.0 | 1933 | ||
| Kent Greenfield | 21 | 304.0 | 1933 | ||
| Al Grabowski | 21 | 255.0 | 1933 | ||
| Garland Buckeye | 21 | 366.7 | 1931 | ||
| Dave Keefe | 21 | 342.3 | 1931 | ||
| Carl Hubbell | 21 | 353.7 | 1930 | ||
| Jumbo Elliott | 21 | 340.7 | 1930 | ||
| Dutch Henry | 21 | 334.7 | 1930 | ||
| George Uhle | 21 | 324.3 | 1930 | ||
| Pete Appleton | 21 | 321.0 | 1930 | ||
| Waite Hoyt | 21 | 300.7 | 1930 | ||
| 287. | Eric King | 20 | 228.7 | 1989 | |
| Bob Sebra | 20 | 187.0 | 1988 | ||
| Frank Maccormack | 20 | 209.7 | 1987 | ||
| Manny Sarmiento | 20 | 227.0 | 1985 | ||
| Jim Winn | 20 | 199.3 | 1985 | ||
| Britt Burns | 20 | 230.3 | 1984 | ||
| Gary Beare | 20 | 178.7 | 1984 | ||
| Bert Blyleven | 20 | 321.0 | 1983 | ||
| Fernando Arroyo | 20 | 277.0 | 1983 | ||
| Jim Hughes | 20 | 185.7 | 1981 | ||
| Wayne Twitchell | 20 | 181.7 | 1980 | ||
| Jon Matlack | 20 | 263.7 | 1979 | ||
| Joe Sambito | 20 | 228.3 | 1978 | ||
| Mike Stanton | 20 | 208.0 | 1978 |
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