| 1891 MLB Leaders | ||
| 1891 National League Standings | |||||||||
| TEAM | W | L | PCT | GB | HOME | ROAD | RS | RA | DIFF |
| *-Boston | 87 | 51 | .621 | -- | -- | -- | 847 | 658 | +189 |
| Chicago | 82 | 53 | .599 | 3.5 | -- | -- | 832 | 730 | +102 |
| New York | 71 | 61 | .522 | 13 | -- | -- | 754 | 711 | +43 |
| Philadelphia | 68 | 69 | .493 | 18.5 | -- | -- | 756 | 773 | -17 |
| Cleveland | 65 | 74 | .461 | 22.5 | -- | -- | 835 | 888 | -53 |
| Brooklyn | 61 | 76 | .445 | 25.5 | -- | -- | 765 | 820 | -55 |
| Cincinnati | 56 | 81 | .406 | 30.5 | -- | -- | 646 | 790 | -144 |
| Pittsburgh | 55 | 80 | .401 | 30.5 | -- | -- | 679 | 744 | -65 |
| 1891 American Assoc. Standings | |||||||||
| TEAM | W | L | PCT | GB | HOME | ROAD | RS | RA | DIFF |
| x-Boston | 93 | 42 | .669 | -- | -- | -- | 1028 | 675 | +353 |
| St. Louis | 86 | 52 | .610 | 8.5 | -- | -- | 976 | 753 | +223 |
| Milwaukee | 21 | 15 | .583 | 22.5 | -- | -- | 227 | 156 | +71 |
| Baltimore | 71 | 64 | .511 | 22 | -- | -- | 850 | 798 | +52 |
| Philadelphia | 73 | 66 | .510 | 22 | -- | -- | 817 | 794 | +23 |
| Columbus | 61 | 76 | .442 | 33 | -- | -- | 702 | 777 | -75 |
| Cincinnati | 43 | 57 | .422 | 32.5 | -- | -- | 549 | 643 | -94 |
| Louisville | 55 | 84 | .390 | 40 | -- | -- | 713 | 890 | -177 |
| Washington | 44 | 91 | .317 | 49 | -- | -- | 691 | 1067 | -376 |
| 1891 All-Star Results | |||||||||
| No results available. | |||||||||
| Rosters | Complete Results | |||||||||
| 1891 Postseason Results | ||
| No results available. | ||
| Complete Results |
| 1891 Award Winners | ||
| No award winners. | ||
| Complete Results |
| 1891 Draft Picks | |||
| No picks available. | |||
| Complete Results |
| 1891 No-Hitters | ||||||
| DATE | PITCHER | TEAM | OPPONENT | SCORE | LEAGUE | NOTES |
| 10/4/1891 | Ted Breitenstein | STL | LOU | 8-0 | ||
| 7/31/1891 | Amos Rusie | NY | BRK | 6-0 | NL | |
| 6/22/1891 | Tom Lovett | BRK | NY | 4-0 | NL | |
| Complete Results | ||||||