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| Career Post-Season Losses Leaderboard | |
| * - Indicates Hall of Fame Bold - Indicates active player |
| Rank | Player | Losses | IP | Years | Single Season Leaderboard |
| 1. | Bill Landis | 19 | 247.3 | 1966-1978 | |
| 2. | Earl Johnson * | 17 | 382.9 | 1942-1956 | |
| 3. | Billy Hoeft | 16 | 299.3 | 1956-1969 | |
| Chuck Stobbs * | 16 | 316.0 | 1950-1968 | ||
| 5. | J.R. Richard * | 15 | 335.0 | 1973-1985 | |
| Sandy Koufax * | 15 | 297.0 | 1958-1971 | ||
| 7. | Gary Nolan * | 13 | 312.3 | 1968-1986 | |
| 8. | Ed Halicki | 12 | 141.3 | 1975-1985 | |
| Bill Butler | 12 | 172.3 | 1972-1979 | ||
| Dean Chance | 12 | 283.3 | 1962-1975 | ||
| Monte Pearson | 12 | 119.7 | 1934-1944 | ||
| Bill Swift * | 12 | 238.3 | 1933-1942 | ||
| 13. | Andy Rincon | 11 | 183.7 | 1982-1990 | |
| Nino Espinosa | 11 | 149.6 | 1979-1989 | ||
| Bill Slayback | 11 | 160.3 | 1972-1982 | ||
| Joe Moeller * | 11 | 195.0 | 1965-1979 | ||
| Bob Veale | 11 | 248.0 | 1964-1972 | ||
| Rollie Sheldon | 11 | 259.3 | 1965-1971 | ||
| Stu Miller | 11 | 152.3 | 1953-1962 | ||
| Preacher Roe | 11 | 138.0 | 1938-1947 | ||
| Claude Passeau | 11 | 132.6 | 1935-1947 | ||
| 22. | Jim Maloney | 10 | 150.3 | 1962-1970 | |
| Ralph Winegarner | 10 | 178.3 | 1934-1947 | ||
| 24. | Jeff Reardon | 9 | 41.0 | 1980-1990 | |
| Bart Johnson | 9 | 148.0 | 1976-1985 | ||
| Jerry Reuss | 9 | 126.6 | 1979-1984 | ||
| Jerry Stephenson | 9 | 244.6 | 1968-1977 | ||
| Masanori Murakami | 9 | 97.0 | 1968-1977 | ||
| Jim Brewer * | 9 | 116.0 | 1964-1974 | ||
| Joe Hoerner | 9 | 127.7 | 1964-1972 | ||
| Gary Peters | 9 | 243.7 | 1962-1971 | ||
| Johnny Antonelli | 9 | 149.6 | 1948-1960 | ||
| Russ Bauers | 9 | 89.3 | 1937-1945 | ||
| George Winn | 9 | 83.3 | 1930-1934 | ||
| 35. | Eduardo Rodriguez | 8 | 175.0 | 1979-1987 | |
| Dick Ruthven | 8 | 124.7 | 1978-1984 | ||
| Pedro Borbon | 8 | 101.0 | 1971-1980 | ||
| Al Hrabosky | 8 | 100.0 | 1970-1980 | ||
| Steve Carlton * | 8 | 130.0 | 1967-1978 | ||
| Mike Marshall | 8 | 122.0 | 1969-1978 | ||
| Hal Reniff | 8 | 200.3 | 1962-1977 | ||
| Vida Blue | 8 | 136.0 | 1971-1977 | ||
| Billy McCool | 8 | 89.7 | 1968-1977 | ||
| Jim O'Toole | 8 | 184.3 | 1958-1971 | ||
| Jim Kaat | 8 | 140.3 | 1962-1971 | ||
| Herb Score | 8 | 186.6 | 1958-1969 | ||
| George Brunet | 8 | 172.7 | 1959-1966 | ||
| Red Embree | 8 | 73.7 | 1947-1952 | ||
| Johnny Allen | 8 | 83.0 | 1932-1940 | ||
| Ed Baecht | 8 | 145.6 | 1932-1939 |
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