Wikipedia:WikiProject Baseball/Team abbreviations
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American and National Leagues (1901–present)
American League
| Abbreviation | Franchise |
| ANA | Anaheim Angels |
| ATH | Athletics |
| BAL | Baltimore Orioles (1901–1902) |
| BAL | Baltimore Orioles (1954–present) |
| BOS | Boston Red Sox |
| CAL | California Angels |
| CWS | Chicago White Sox |
| CLE | Cleveland Guardians/Indians/Naps/Broncos/Bluebirds |
| DET | Detroit Tigers |
| HOU | Houston Astros (2013–present) |
| KCA | Kansas City Athletics |
| KC | Kansas City Royals |
| LAA | Los Angeles Angels (of Anaheim) |
| MIL | Milwaukee Brewers (1970–1997) |
| MIL | Milwaukee Brewers (1901) |
| MIN | Minnesota Twins |
| NYH | New York Highlanders |
| NYY | New York Yankees |
| OAK | Oakland Athletics |
| PHA | Philadelphia Athletics |
| SEA | Seattle Mariners |
| SEA | Seattle Pilots |
| SLB | St. Louis Browns |
| TB | Tampa Bay Rays/Devil Rays |
| TEX | Texas Rangers |
| TOR | Toronto Blue Jays |
| WAS | Washington Senators (1961–1971) |
| WSH | Washington Senators (1901–1960) |
National League (from 1901)
| Abbreviation | Franchise |
| AZ | Arizona Diamondbacks |
| ATL | Atlanta Braves |
| BSN | Boston Braves/Bees/Rustlers/Doves/Beaneaters |
| BRO | Brooklyn Dodgers/Robins/Trolley Dodgers/Superbas/Bridegrooms |
| CHC | Chicago Cubs/Orphans |
| CIN | Cincinnati Reds/Redlegs |
| COL | Colorado Rockies |
| FLA | Florida Marlins |
| HOU | Houston Astros/Colt .45s (1962–2012) |
| LAD | Los Angeles Dodgers |
| MIA | Miami Marlins |
| MIL | Milwaukee Brewers (1998–present) |
| MIL | Milwaukee Braves |
| MON | Montreal Expos |
| NYG | New York Giants |
| NYM | New York Mets |
| PHI | Philadelphia Phillies/Phils |
| PIT | Pittsburgh Pirates |
| SD | San Diego Padres |
| SF | San Francisco Giants |
| STL | St. Louis Cardinals |
| WSH | Washington Nationals |
Defunct and pre-modern leagues
National League (1876–1900)
| Abbreviation | Franchise |
| BAL | Baltimore Orioles (1892–1899) |
| BSN | Boston Beaneaters/Red Caps/Red Stockings |
| BRO | Brooklyn Superbas/Bridegrooms/Grooms |
| BUF | Buffalo Bisons |
| CHI | Chicago Orphans/Colts/White Stockings |
| CIN | Cincinnati Reds (1876–1879) |
| CIN | Cincinnati Stars |
| CIN | Cincinnati Reds (1890–present) |
| CLE | Cleveland Blues |
| CLE | Cleveland Spiders |
| DET | Detroit Wolverines |
| HAR | Hartford Dark Blues/Brooklyn Hartfords |
| IND | Indianapolis Blues |
| IND | Indianapolis Hoosiers |
| KC | Kansas City Cowboys |
| LOU | Louisville Grays |
| LOU | Louisville Colonels |
| MIL | Milwaukee Grays |
| NYG | New York Giants/Gothams |
| NYM | New York Mutuals |
| PHN | Philadelphia Athletics (1876) |
| PHI | Philadelphia Phillies/Quakers |
| PIT | Pittsburgh Pirates/Alleghenys |
| PRO | Providence Grays |
| STL | St. Louis Brown Stockings |
| SLM | St. Louis Maroons |
| STL | St. Louis Cardinals/Perfectos/Browns |
| SYR | Syracuse Stars |
| TRO | Troy Trojans |
| WAS | Washington Nationals (1886–1889) |
| WAS | Washington Senators (1892–1899) |
| WOR | Worcester Worcesters/Brown Stockings/Ruby Legs |
American Association (1882–1891)
| Abbreviation | Franchise |
| BAL | Baltimore Orioles (1882–1891) |
| BSR | Boston Reds |
| BRO | Brooklyn Bridegrooms/Grays/Atlantics |
| BKG | Brooklyn Gladiators |
| CIN | Cincinnati Red Stockings |
| CKE | Cincinnati Kelly's Killers |
| CLE | Cleveland Blues |
| COL | Columbus Buckeyes |
| COL | Columbus Solons |
| IND | Indianapolis Hoosiers |
| KC | Kansas City Cowboys |
| LOU | Louisville Colonels |
| MIL | Milwaukee Brewers (1891) |
| NYM | New York Metropolitans |
| PHA | Philadelphia Athletics (1882–1890) |
| PHA | Philadelphia Athletics/Quakers (1891) |
| PIT | Pittsburgh Alleghenys |
| RIC | Richmond Virginians |
| RCH | Rochester Broncos/Hop Bitters |
| STL | St. Louis Browns/Brown Stockings |
| SYR | Syracuse Stars |
| TOL | Toledo Blue Stockings |
| TOL | Toledo Maumees |
| WSN | Washington Nationals (AA) (1884) |
| WAS | Washington Statesmen |
Union Association (1884)
| Abbreviation | Franchise |
| ALT | Altoona Mountain Citys |
| BLU | Baltimore Monumentals |
| BSU | Boston Reds |
| CUN | Chicago Browns/Pittsburgh Stogies |
| COR | Cincinnati Outlaw Reds |
| KC | Kansas City Cowboys |
| MIL | Milwaukee Brewers (1884) |
| PHK | Philadelphia Keystones |
| SLM | St. Louis Maroons |
| SPS | St. Paul Saints |
| WST | Washington Nationals (UA) (1884) |
| WIL | Wilmington Quicksteps |
Players' League (1890)
| Abbreviation | Franchise |
| BSR | Boston Reds |
| BKW | Brooklyn Ward's Wonders |
| BUF | Buffalo Bisons |
| CPI | Chicago Pirates |
| CLI | Cleveland Infants |
| NYK | New York Giants |
| PHQ | Philadelphia Athletics |
| PBU | Pittsburgh Burghers |
Federal League (1914–1915)
| Abbreviation | Franchise |
| BAL | Baltimore Terrapins |
| BKF | Brooklyn Tip-Tops/Feds |
| BUF | Buffalo Blues/Buffeds |
| CWH | Chicago Whales/Federals |
| IND | Indianapolis Hooisers |
| KC | Kansas City Packers |
| NWK | Newark Peppers |
| PRB | Pittsburgh Rebels |
| SLT | St. Louis Terriers |
Negro National League I (1920–1931)
| Abbreviation | Franchise |
| BBB | Birmingham Black Barons |
| CAG | Chicago American Giants |
| CHG | Chicago Giants |
| CLB | Cleveland Browns |
| CCU | Cleveland Cubs |
| CEL | Cleveland Elites |
| CLH | Cleveland Hornets |
| CTS | Cleveland Tate Stars |
| CTG | Cleveland Tigers |
| COL | Columbus Buckeyes |
| CUB | Cuban Stars West/Cincinnati Cuban Stars |
| DAY | Dayton Marcos |
| DTS | Detroit Stars |
| ABC | Indianapolis ABCs |
| KCM | Kansas City Monarchs |
| LBC | Louisville Black Caps |
| LWS | Louisville White Sox |
| MEM | Memphis Red Sox |
| MIL | Milwaukee Bears |
| NEG | Nashville Elite Giants |
| PTK | Pittsburgh Keystones |
| SLG | St. Louis Giants |
| SLS | St. Louis Stars |
| TOL | Toledo Tigers |
Eastern Colored League (1923–1928)
| Abbreviation | Franchise |
| BG | Atlantic City Bacharach Giants |
| BBS | Baltimore Black Sox |
| BRG | Brooklyn Royal Giants |
| CSE | Cuban Stars East |
| HBG | Harrisburg Giants |
| HIL | Hilldale Club/Daisies |
| NYL | New York Lincoln Giants |
| NS | Newark Stars |
| PTG | Philadelphia Tigers |
| WP | Washington/Wilmington Potomacs |
American Negro League (1929)
| Abbreviation | Franchise |
| BG | Atlantic City Bacharach Giants |
| BBS | Baltimore Black Sox |
| BRG | Brooklyn Royal Giants |
| CSE | Cuban Stars East |
| HIL | Hilldale Club/Daisies |
| HOM | Homestead Grays |
| NYL | New York Lincoln Giants |
East–West League (1932)
| Abbreviation | Franchise |
| BBS | Baltimore Black Sox |
| CLS | Cleveland Stars |
| DTW | Detroit Wolves |
| HIL | Hilldale Club/Daisies |
| HOM | Homestead Grays |
| NEW | Newark Browns |
| CUP | Pollock's Cuban Stars |
| WPI | Washington Pilots |
Negro Southern League (1932)
| Abbreviation | Franchise |
| ATL | Atlanta Black Crackers |
| BBB | Birmingham Black Barons |
| CAG | Cole's/Chicago American Giants |
| IND | Indianapolis ABCs |
| LRG | Little Rock Grays |
| LBC | Louisville Black Caps/Columbus Turf Club |
| MEM | Memphis Red Sox |
| MON | Monroe Monarchs |
| MNT | Montgomery Grey Sox |
| NEG | Nashville Elite Giants |
Negro National League II (1933–1948)
Negro American League (1937–1948)
| Abbreviation | Franchise |
| ATL | Atlanta Black Crackers/Indianapolis ABCs (1939) |
| BBB | Birmingham Black Barons |
| CAG | Chicago American Giants |
| CC | Cincinnati Clowns |
| CIC | Cincinnati–Indianapolis Clowns |
| CIB | Cincinnati/Cincinnati–Cleveland Buckeyes |
| CLB | Cleveland Buckeyes |
| CT | Cincinnati Tigers |
| CBR | Cleveland Bears |
| DTS | Detroit Stars |
| ABC | Indianapolis ABCs (1938) |
| ATH | Indianapolis Athletics |
| IC | Indianapolis Clowns |
| JRC | Jacksonville Red Caps |
| KCM | Kansas City Athletics |
| MEM | Memphis Red Sox |
| SLS | St. Louis Stars |
| SNS | St. Louis–New Orleans Stars |
| TC | Toledo Crawfords |
| TIC | Toledo–Indianapolis Crawfords |