 
 The following are the baseball events of the year 1991 throughout the world.
| League Championship Series (ALCS, NLCS) | World Series | ||||||||
| East | Toronto | 1 | |||||||
| West | Minnesota | 4 | |||||||
| AL | Minnesota | 4 | |||||||
| NL | Atlanta | 3 | |||||||
| East | Pittsburgh | 3 | |||||||
| West | Atlanta | 4 | |||||||
| American League | National League | |||
|---|---|---|---|---|
| Type | Name | Stat | Name | Stat | 
| AVG | Julio Franco TEX | .341 | Terry Pendleton ATL | .319 | 
| HR | Jose Canseco OAK Cecil Fielder DET | 44 | Howard Johnson NYM | 38 | 
| RBI | Cecil Fielder DET | 133 | Howard Johnson NYM | 117 | 
| Wins | Scott Erickson MIN Bill Gullickson DET | 20 | Tom Glavine ATL John Smiley PIT | 20 | 
| ERA | Roger Clemens BOS | 2.62 | Dennis Martínez MON | 2.39 | 
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| Team | Manager | Comments | 
|---|---|---|
| Baltimore Orioles | Frank Robinson | Replaced during the season by Johnny Oates | 
| Boston Red Sox | Joe Morgan | |
| California Angels | Doug Rader | Replaced during the season by Buck Rodgers | 
| Chicago White Sox | Jeff Torborg | |
| Cleveland Indians | John McNamara | Replaced during the season by Mike Hargrove | 
| Detroit Tigers | Sparky Anderson | |
| Kansas City Royals | John Wathan | Replaced during the season by Hal McRae | 
| Milwaukee Brewers | Tom Trebelhorn | |
| Minnesota Twins | Tom Kelly | Won the World Series | 
| New York Yankees | Stump Merrill | |
| Oakland Athletics | Tony La Russa | |
| Seattle Mariners | Jim Lefebvre | |
| Texas Rangers | Bobby Valentine | |
| Toronto Blue Jays | Cito Gaston | Replaced temporarily by Gene Tenace while undergoing treatment for a herniated disc, Won American League East | 
| Team | Manager | Comments | 
|---|---|---|
| Atlanta Braves | Bobby Cox | Won National League pennant | 
| Chicago Cubs | Don Zimmer | Replaced during the season by Jim Essian | 
| Cincinnati Reds | Lou Piniella | |
| Houston Astros | Art Howe | |
| Los Angeles Dodgers | Tommy Lasorda | |
| Montreal Expos | Buck Rodgers | Replaced during the season by Tom Runnels | 
| New York Mets | Bud Harrelson | Replaced during the season by Mike Cubbage | 
| Philadelphia Phillies | Nick Leyva | Replaced during the season by Jim Fregosi | 
| Pittsburgh Pirates | Jim Leyland | Won National League East | 
| St. Louis Cardinals | Joe Torre | |
| San Diego Padres | Greg Riddoch | |
| San Francisco Giants | Roger Craig |