Arizona Diamondbacks

The D-backs – Short form of "Diamondbacks". The Snakes – A reference to diamondback rattlesnakes. The D-bags – A reference to the colloquial insult term douchebag used by detractors. The Answerbacks – A reference to the 2023 team that went on to win the National League pennant after the Diamondbacks fell to a 2-0 and 3-2 series deficit to the Phillies in the 2023 NLCS only for Arizona to rally back to win the series with a Game 4 comeback at home and two consecutive road wins in Philadelphia in Games 6 and 7.

Athletics

Mackmen (when the team played in Philadelphia) – In reference to their manager, Connie Mack. The A's – Short form of "Athletics". Emphasized by Charlie Finley during his ownership of the team in the 1960s and 1970s. Perhaps the most commonly used nickname on this list. The Green and Gold – A reference to the current team's colors. The Swingin' A's – A reference to the early 1970s championship teams. The Big Green Machine – Based on the Big Red Machine nickname of the Cincinnati Reds, another team that dominated in the 1970s. The White Elephants – A reference to their mascot, which is itself a defiant reference to a comment made by Hall of Fame manager John McGraw, calling the team a "white elephant". The Elephants – Short form of the previous. The Oakland Triple-A's (AAAs) – A reference to Triple-A Minor League Baseball, used by some to highlight their lack of competitive skill or poor play during rough years. Assletics – Used by detractors, especially when the team performs poorly during a season.

Atlanta Braves

The Bravos – Variation of "Braves". America's Team – A reference to the Braves' games being broadcast nationwide. The Barves – Another variation of "Braves", derived from a misspelling of the team's name on counterfeit merchandise. Used by detractors, primarily Philadelphia Phillies fans. Braves Country – A term for the team's avid followers, particularly those in the Southeast. Georgia Braves – A reference to the fact that the team is located in Georgia. The Cowards – Opposite of Braves; used derisively by detractors. The Peach Clobbers – Nickname of the hard-hitting 2013 team. The Curse City of Atlanta – A reference to Atlanta teams having a history of struggling in the playoffs; used derisively by detractors.

Baltimore Orioles The O's – Short form of "Orioles". Fans traditionally shout the "O!" at the beginning of the seventh line of the Star Spangled Banner in unison. The Birds – A reference to orioles, which are birds. The Orange Birds – A reference to male orioles, which are orange birds. The Oreos – Homophone of "Orioles", used particularly among older fans.

Boston Red Sox

The BoSox – Combination of "Boston" and "Sox". Coined by the media to distinguish from the Chicago White Sox, or "ChiSox". The Sox – Short form of "Red Sox". The Sawx – In imitation of the Boston accent. The Crimson Hose – A variation of "Red Sox". The Olde Towne Team The Carmines – A type of red pigment. This nickname is used often by former Red Sox player and retired White Sox broadcaster Ken Harrelson. Red Sox Nation – Avid followers. The Nation – Short form of "Red Sox Nation". The Cardiac Kids – 1967 team nickname. The Red Sux – Used by detractors, particularly by fans of the New York Yankees. The Dead Sox – A reference to the Game 7 loss in the 2003 ALCS to the Yankees.Dead Sox! – New York Yankees closer Mariano Rivera's Greatest Saves. ESPN.com.

Chicago Cubs

The Cubbies – Familiar version of "Cubs". The Baby Bears – Referring to the meaning of cubs. The Little Bears – Referring to the meaning of cubs. The Blue Bears – Referring to the color of the bear in the team's logo. Go Cubs Go – An official team and victory song written by Steve Goodman in 1984 that becomes popular when the Cubs are successful. The Loveable Losers – A reference to the team's ability to maintain a loyal fan base despite decades of failure to win the pennant. The Northsiders – To differentiate from the White Sox, who play on the South Side. The Northside Nine – Same as the previous. The Flubs – Referring to the Cubs team when failing to meet expectations. The Boys of Zimmer – A reference to the NL East division-winning 1989 team managed by Don Zimmer and the 1972 book, The Boys of Summer by Roger Kahn. The Big Blue Train Chicago Orphans – Cap Anson was the first player credited with 3,000 hits. In 1897 he was released as player/manager after 22 seasons with the club. After his departure, they became known as the Orphans.

Chicago White Sox

The Sox – Short form of "White Sox". The ChiSox – Combination of "Chicago" and "Sox". Coined by the media to distinguish from the Boston Red Sox, or "BoSox". The Southsiders – To differentiate from the Cubs, who play on the North Side. The Pale Hose – Variation of "White Sox". The Black and White – A reference to the team's colors. The Hitless Wonders – A reference to the 1906 team that won the AL pennant and World Series despite a .230 team batting average. The Black Sox – A reference to the infamous 1919 team, which fixed the World Series in what came to be known as the "Black Sox Scandal". The Go-Go Sox – A reference to the 1959 AL championship team. The South Side Hitmen – A reference to the high-slugging 1977 team. Winning Ugly – A reference to the 1983 division champion team. The White Sux – A reference to the 2024 team, which broke the record for most losses in a single season. One-Two-One – Another reference to the 2024 team, with the nickname being the total losses in the 2024 MLB season.

Cincinnati Reds

The Big Red Machine – A reference to the 1970s teams that won six divisional titles, four pennants and two World Series titles. The RedlegsFried, Richard M., Nightmare in Red: The McCarthy Era in Perspective, Oxford University Press – Temporary team name to differentiate from Communists during the Red Scare, who were also referred to as "Reds". The Nasty Boys – A reference to the bullpen trio of Rob Dibble, Norm Charlton, and Randy Myers, who led the 1990 Reds to a World Series sweep.

Cleveland Guardians

The Guards – Short form of "Guardians". Guardiac Kids – A play on Kardiac Kids, a beloved nickname of the local football team (Cleveland Browns). Also, alluding to the youngest player roster in all of MLB and AAA (26 years) during the 2022 inaugural season with the new name, Guardians. Indians – A reference to the team's former name. The Tribe – A reference to the team's former name. Tribes are social structures among American Indigenous people. Chief Wahoo's Tribe – A reference to the team's former logo, an Indigenous person called "Chief Wahoo". The Wahoos – Same as the previous. The Windians – A reference to the team that wins a lot, especially the 22-game winning streak in 2017. The number of W's before 'Indians' represents how many games the Indians won in a row. The Injuns – Used by detractors. The Erie Warriors – A reference to Cleveland's location on the shore of Lake Erie.

Colorado Rockies

The Rocks – Short form of "Rockies". The Rox – Homophone of "Rocks". Imitation of the names of the Red Sox and White Sox. The Blake Street Bombers – A reference to the street Coors Field is on. The Blake Street Bullies – Same as the previous. Todd and the Toddlers – A reference to when Rockies first baseman Todd Helton was a veteran player surrounded by a team full of rookies and young players.

Detroit Tigers

The Cats – A reference to tigers being members of the cat family. The Motor City Kitties – A nickname given during the 2003 season, when the team finished with a 43–119 record. The Kitties – Short form of the previous. The Tabbies – Playful feline variation. The Tiggs – Short form of "Tigers". The Declawed Tigers – A reference to their 12 consecutive losing seasons from 1994 to 2005. The Pussies or Pussys – Used by detractors, mainly White Sox and Twins fans. The Pussy Cats – Same as the previous. The Bengals – A reference to Bengal tigers, a species of tiger. The Bengal Tigers – Long form of the previous. Motor City Bengals – Same as the previous but with a reference to Motor City, one of the city of Detroit's nicknames. The/Los Tigres – Playful Spanish variation, often used with English definite article "The" instead of the Spanish "Los". The Bless You Boys – A reference to the World Series championship team of 1984 and teams from surrounding years. The Gritty Tigs – A reference to the 2024 team. The Wolverines – A reference to the University of Michigan Wolverines and to Detroit's first MLB team.

Houston Astros

The Killer B's – From the 1990s. A reference to the team whose players' surnames begin with the letter B that won four National League Central divisional titles and one National League pennant. The Stros – Short form of "Astros". Crush City – A reference to the 2015 team that led the league in home runs. The Stars – A reference to the team logo. The Astronauts – Long form of "Astros". To honor astronauts who occasionally come to the ballpark. The Blastros – A reference to having a lot of home run pop in the lineup since 2015.Carlos Correa meets singer Marc Anthony, makes spring debut. Houston Chronicle. The Astronomicals – From Cincinnati Reds radio broadcaster Marty Brennaman. 8th Wonder of the World – A homage to the team's former stadium, the Astrodome, the world's first multipurpose domed sports stadium. The Asstros – Used by detractors. The Asterisks – Used by detractors. In reference to the 2017 sign stealing scandal. The Cheaters – Used by detractors. In reference to the 2017 sign stealing scandal. Cheat City – Used by detractors. Also in reference to the 2017 sign stealing scandal. The Trashcans – Used by detractors. Also in reference to the 2017 sign stealing scandal. Trashcan Bangers – Used by detractors. Also in reference to the 2017 sign stealing scandal. The Asstrolls – Used by detractors. Also in reference to the 2017 sign stealing scandal. Trash City – Used by detractors. Also in reference to the 2017 sign stealing scandal. The Cheatros – Used by detractors. Also in reference to the 2017 sign stealing scandal. The Asteroids – Used jokingly following a fan interview conducted by ESPN during a Sunday night game in September 2023. The Trashtros – Used by detractors. Also in reference to the 2017 sign stealing stealing scandal.scandal.

Kansas City Royals

The Boys in Blue – A reference to one of the team's colors. Not commonly used, except in marketing. The Comeback Kids – A reference to the young Royals team winning eight postseason games via comebacks en route to their 2015 World Series title. The Crowns – A reference to the crown in the team logo, and at the top of the large video board at Kauffman Stadium. The Monarchs – A reference to the former Negro league team in Kansas City. Also a term associated with royalty. The 'Yals – Abbreviation of Royals, used particularly among younger fans. The Forever Royals – A reference to the core players Salvador Perez, Alex Gordon, Eric Hosmer, Mike Moustakas, Lorenzo Cain, and Alcides Escobar that helped the Royals win the 2015 World Series and remain beloved by Royals fans.

Los Angeles Angels

The Halos – A reference to an angel's halo. The halo is featured on the large "A" outside the stadium and was once a prominent part of the team logo. The Anaheim Angels – The team's official name from 1997 to 2004; a reference to the fact that the Angels are not from Los Angeles County, but the Orange County city of Anaheim. Los Angeles Angels of Anaheim – The team's official name from 2005 to 2015; the team went by this to fulfill a contractual obligation to the City of Anaheim. The Angels Angels of Anaheim – Spanish "Los Angeles" translated to English. Los Angelinos – Name in Spanish. A reference to the large Hispanic population of Orange County.