Players — A
- David Aardsma 2004–2015
- Hank Aaron 1954–1976
- Tommie Aaron 1962–1971
- Don Aase 1977–1990
- Andy Abad 2001–2006
- Fernando Abad 2010–2023
- John Abadie 1875–1875
- Ed Abbaticchio 1897–1910
- Bert Abbey 1892–1896
- Charlie Abbey 1893–1897
- Andrew Abbott 2023–2025
- Cory Abbott 2021–2023
- Dan Abbott 1890–1890
- Fred Abbott 1903–1905
- Glenn Abbott 1973–1984
- Jeff Abbott 1997–2001
- Jim Abbott 1989–1999
- Jim Abbott 1906–1907
- Kurt Abbott 1993–2001
- Kyle Abbott 1991–1996
- Ody Abbott 1910–1910
- Paul Abbott 1990–2004
- Mick Abel 2025–2025
- Al Aber 1950–1957
- Frank Abercrombie 1871–1871
- Reggie Abercrombie 2006–2008
- Bill Abernathie 1952–1952
- Brent Abernathy 2001–2005
- Robert Abernathy 1945–1948
- Ted Abernathy 1942–1944
- Ted Abernathy 1955–1972
- Woody Abernathy 1946–1947
- Cliff Aberson 1947–1949
- Harry Ables 1905–1911
- Philip Abner 2025–2025
- Shawn Abner 1987–1992
- CJ Abrams 2022–2025
- Cal Abrams 1949–1956
- George Abrams 1923–1923
- Johnny Abrego 1985–1985
- Albert Abreu 2020–2023
- Bobby Abreu 1996–2014
- Bryan Abreu 2019–2025
- Eufemio Abreu 1919–1925
- Joe Abreu 1942–1942
- Jose Abreu 2014–2024
- Juan Abreu 2011–2011
- Tony Abreu 2007–2014
- Wilyer Abreu 2023–2025
- Winston Abreu 2006–2009
- Bill Abstein 1906–1910
- Jeremy Accardo 2005–2012
- acea01 1910–1910
- Domingo Acevedo 2021–2023
- Jose Acevedo 2001–2005
- Juan Acevedo 1995–2003
- Alfredo Aceves 2008–2014
- A. J. Achter 2014–2016
- Jim Acker 1983–1992
- Tom Acker 1956–1959
- Dustin Ackley 2011–2016
- Fritz Ackley 1963–1964
- Cy Acosta 1972–1975
- Ed Acosta 1970–1972
- Jose Acosta 1920–1922
- Manny Acosta 2007–2012
- Maximo Acosta 2025–2025
- Merito Acosta 1913–1918
- Mark Acre 1994–1997
- Garrett Acton 2023–2025
- Luisangel Acuña 2024–2025
- Ronald Acuña 2018–2025
- Jerry Adair 1958–1970
- Jimmy Adair 1931–1931
- Jason Adam 2018–2025
- Cristhian Adames 2014–2019
- Willy Adames 2018–2025
- Ace Adams 1941–1946
- Austin Adams 2017–2024
- Austin Adams 2014–2019
- Babe Adams 1906–1926
- Bert Adams 1910–1919
- Bob Adams 1925–1925
- Bob Adams 1931–1932
- Bob Adams 1977–1977
- Bobby Adams 1946–1959
- Buster Adams 1939–1947
- Chance Adams 2018–2020
- Dan Adams 1914–1915
- David Adams 2013–2013
- Dick Adams 1947–1947
- Doug Adams 1969–1969
- Emery Adams 1932–1947
- George Adams 1879–1879
- Glenn Adams 1975–1982
- Herb Adams 1948–1950
- Jim Adams 1890–1890
- Joe Adams 1902–1902
- Jordyn Adams 2023–2025
- Karl Adams 1914–1915
- Lane Adams 2014–2018
- Matt Adams 2012–2021
- Mike Adams 2004–2014
- Mike Adams 1972–1978
- Packinghouse Adams 1935–1935
- Red Adams 1946–1946
- Rick Adams 1905–1905
- Ricky Adams 1982–1985
- Riley Adams 2021–2025
- Russ Adams 2004–2009
- Ryan Adams 2011–2011
- Sparky Adams 1922–1934
- Spencer Adams 1923–1927
- Terry Adams 1995–2005
- Travis Adams 2025–2025
- Willie Adams 1912–1919
- Willie Adams 1996–1997
- adams01 1942–1942
- Joel Adamson 1996–1998
- Mike Adamson 1967–1969
- Joe Adcock 1950–1966
- Nathan Adcock 2011–2015
- Ty Adcock 2023–2025
- Bob Addis 1950–1953
- Keenan Addison 1911–1911
- Tom Addison 1910–1911
- Jim Adduci 2013–2019
- Jim Adduci 1983–1989
- Bob Addy 1871–1877
- Jo Adell 2020–2025
- Nick Adenhart 2008–2009
- Morrie Aderholt 1939–1945
- Dewey Adkins 1942–1949
- Dick Adkins 1942–1942
- Grady Adkins 1928–1929
- Jon Adkins 2003–2008
- Merle Adkins 1902–1903
- Steve Adkins 1990–1990
- Tim Adleman 2016–2017
- Dave Adlesh 1963–1968
- Joan Adon 2021–2024
- Ehire Adrianza 2013–2024
- Troy Afenir 1987–1992
- Jeremy Affeldt 2002–2015
- Benny Agbayani 1998–2002
- Tommie Agee 1962–1973
- Harry Agganis 1954–1955
- Joe Agler 1912–1915
- Sam Agnew 1913–1919
- Zach Agnos 2025–2025
- Juan Agosto 1981–1993
- Dario Agrazal 2019–2019
- Luis Aguayo 1980–1989
- Julian Aguiar 2024–2024
- Chris Aguila 2004–2008
- Jesus Aguilar 2014–2023
- Miguel Aguilar 2021–2021
- Ryan Aguilar 2022–2022
- Rick Aguilera 1985–2000
- Hank Aguirre 1955–1970
- Bill Ahearn 1880–1880
- Pat Ahearne 1995–1995
- Nick Ahmed 2014–2025
- Willie Aikens 1977–1985
- Danny Ainge 1979–1981
- Eddie Ainsmith 1910–1924
- Kurt Ainsworth 2001–2004
- Raleigh Aitchison 1911–1915
- George Aiton 1912–1912
- John Ake 1884–1884
- Jack Aker 1964–1974
- Darrel Akerfelds 1986–1991
- Bill Akers 1929–1932
- Jerry Akers 1912–1912
- Keegan Akin 2020–2025
- Shogo Akiyama 2020–2021
- R. J. Alaniz 2019–2021
- Gibson Alba 1988–1988
- Jonathan Albaladejo 2007–2012
- Joe Albanese 1958–1958
- Jose Alberro 1995–1997
- Andrew Albers 2013–2021
- Matt Albers 2006–2019
- Hanser Alberto 2015–2023
- Butch Alberts 1978–1978
- Cy Alberts 1910–1910
- Gus Alberts 1884–1891
- Johnny Albertson 1937–1937
- Ozzie Albies 2017–2025
- Ed Albosta 1941–1946
- Ed Albrecht 1949–1950
- Jack Albright 1947–1947
- Thomas Albright 1929–1936
- Alex Albritton 1918–1925
- Al Alburquerque 2011–2017
- Vic Albury 1973–1976
- Jorge Alcala 2019–2025
- Santo Alcala 1976–1977
- Arismendy Alcantara 2014–2017
- Israel Alcantara 2000–2002
- Raul Alcantara 2016–2017
- Sandy Alcantara 2017–2025
- Sergio Alcantara 2020–2025
- Victor Alcantara 2017–2019
- Luis Alcaraz 1967–1970
- Scotty Alcock 1914–1914
- Kevin Alcántara 2024–2025
- Sam Aldegheri 2024–2025
- Dale Alderson 1943–1944
- Scott Aldred 1990–2000
- Mike Aldrete 1986–1996
- Jay Aldrich 1987–1990
- Cory Aldridge 2001–2010
- Vic Aldridge 1917–1928
- Chuck Aleno 1941–1944
- Blaze Alexander 2024–2025
- Bob Alexander 1955–1957
- Buck Alexander 1923–1926
- CJ Alexander 2024–2025
- Chuffie Alexander 1927–1932
- Dale Alexander 1929–1933
- Doyle Alexander 1971–1989
- Gary Alexander 1975–1981
- Gerald Alexander 1990–1992
- Hugh Alexander 1937–1937
- Jason Alexander 2022–2025
- Koke Alexander 1920–1921
- Manny Alexander 1992–2006
- Matt Alexander 1973–1981
- Nin Alexander 1884–1884
- Pete Alexander 1911–1930
- Scott Alexander 2015–2025
- Spencer Alexander 1940–1941
- Ted Alexander 1938–1948
- Tyler Alexander 2019–2025
- Walt Alexander 1912–1917
- A. J. Alexy 2021–2022
- Jason Alfaro 2004–2004
- Jorge Alfaro 2016–2025
- Antonio Alfonseca 1997–2007
- Ángel Alfonso 1924–1930
- Edgardo Alfonzo 1995–2006
- Eliezer Alfonzo 2006–2011
- Anthony Alford 2017–2022
- Luis Alicea 1988–2002
- Andy Allanson 1986–1995
- Brian Allard 1979–1981
- Kolby Allard 2018–2025
- Cam Alldred 2022–2022
- Alex Allen 1943–1943
- Austin Allen 2019–2022
- Bernie Allen 1962–1973
- Bob Allen 1919–1919
- Bob Allen 1961–1967
- Bob Allen 1890–1900
- Brandon Allen 2009–2012
- Buddy Allen 1940–1940
- Chad Allen 1999–2005
- Clifford Allen 1937–1938
- Cliney Allen 1932–1932
- Cody Allen 2012–2019
- Dick Allen 1963–1977
- Dusty Allen 2000–2000
- Earl Allen 1937–1937
- Ethan Allen 1926–1938
- Frank Allen 1912–1917
- Greg Allen 2017–2025
- Half Pint Allen 1932–1934
- Ham Allen 1872–1872
- Hank Allen 1966–1973
- Hezekiah Allen 1884–1884
- Horace Allen 1919–1919
- Hosea Allen 1941–1947
- Jack Allen 1879–1879
- Jamie Allen 1983–1983
- John Allen 1914–1914
- Johnny Allen 1932–1944
- Kim Allen 1980–1981
- Lloyd Allen 1969–1975
- Logan Allen 2019–2024
- Logan Allen 2023–2025
- Luke Allen 2002–2003
- Major Allen 1919–1922
- Myron Allen 1883–1888
- Neil Allen 1979–1989
- Newt Allen 1923–1947
- Nick Allen 1914–1920
- Nick Allen 2022–2025
- Pete Allen 1893–1893
- Rod Allen 1983–1988
- Ron Allen 1972–1972
- Sled Allen 1910–1910
- Todd Allen 1915–1925
- Toussaint Allen 1919–1928
- allen01 1910–1910
- Gary Allenson 1979–1985
- Jermaine Allensworth 1996–1999
- Gene Alley 1963–1973
- Nick Allgeyer 2021–2021
- Gair Allie 1954–1954
- Bob Allietta 1975–1975
- Andy Allison 1872–1872
- Art Allison 1871–1876
- Bill Allison 1872–1872
- Bob Allison 1958–1970
- Dana Allison 1991–1991
- Doug Allison 1871–1883
- Mack Allison 1911–1913
- Milo Allison 1913–1917
- Moody Allison 1925–1925
- allis01 1941–1941
- Beau Allred 1989–1991
- Mel Almada 1933–1939
- Armando Almanza 1999–2005
- Carlos Almanzar 1997–2005
- Rafael Almeida 1905–1913
- Bill Almon 1974–1988
- Abraham Almonte 2013–2023
- Edwin Almonte 2003–2003
- Erick Almonte 2001–2011
- Hector Almonte 1999–2003
- Miguel Almonte 2015–2018
- Yency Almonte 2018–2024
- Zoilo Almonte 2013–2014
- Albert Almora 2016–2022
- Luis Aloma 1950–1953
- Roberto Alomar 1988–2004
- Sandy Alomar 1988–2007
- Sandy Alomar 1964–1978
- Pete Alonso 2019–2025
- Rogelio Alonso 1927–1930
- Yonder Alonso 2010–2019
- Felipe Alou 1958–1974
- Jesus Alou 1963–1979
- Matty Alou 1960–1974
- Moises Alou 1990–2008
- Whitey Alpermann 1906–1909
- Dell Alston 1977–1980
- Garvin Alston 1996–1996
- Tom Alston 1954–1957
- Walter Alston 1936–1936
- Porfi Altamirano 1982–1984
- Dan Altavilla 2016–2025
- Ernie Alten 1920–1920
- Jesse Altenburg 1916–1917
- Aaron Altherr 2014–2019
- Dave Altizer 1906–1911
- George Altman 1959–1967
- Joe Altobelli 1955–1961
- Nick Altrock 1898–1933
- Jose Altuve 2011–2025
- Jake Alu 2023–2023
- George Alusik 1958–1964
- Elvis Alvarado 2025–2025
- Jose Alvarado 2017–2025
- Luis Alvarado 1968–1977
- Abe Alvarez 2004–2006
- Andrew Alvarez 2025–2025
- Armando Alvarez 2024–2024
- Clemente Alvarez 2000–2000
- Dariel Alvarez 2015–2016
- Dario Alvarez 2014–2017
- Eddy Alvarez 2020–2024
- Francisco Alvarez 2022–2025
- Gabe Alvarez 1998–2000
- Henderson Alvarez 2011–2017
- Jose Alvarez 2013–2022
- Jose Alvarez 1981–1989
- Juan Alvarez 1999–2003
- Nacho Alvarez 2024–2025
- Orlando Alvarez 1973–1976
- Ossie Alvarez 1958–1959
- Pedro Alvarez 2010–2018
- R. J. Alvarez 2014–2022
- Rogelio Alvarez 1960–1962
- Tavo Alvarez 1995–1996
- Tony Alvarez 2002–2004
- Victor Alvarez 2002–2003
- Wilson Alvarez 1989–2005
- Yordan Alvarez 2019–2025
- Max Alvis 1962–1970
- Billy Alvord 1885–1893
- Brant Alyea 1965–1972
- Adbert Alzolay 2019–2024
- Adael Amador 2024–2025
- Joey Amalfitano 1954–1967
- Rich Amaral 1991–2000
- Alexi Amarista 2011–2017
- Ruben Amaro 1958–1969
- Ruben Amaro 1991–1998
- Jacob Amaya 2023–2025
- Miguel Amaya 2023–2025
- Wayne Ambler 1937–1939
- Chip Ambres 2005–2008
- Hector Ambriz 2010–2014
- Trey Amburgey 2021–2021
- Ed Amelung 1984–1986
- Red Ames 1903–1919
- Steve Ames 2013–2013
- Alfredo Amezaga 2002–2011
- Doc Amole 1897–1898
- Vicente Amor 1955–1957
- Sandy Amoros 1952–1960
- Walter Ancker 1915–1915
- Larry Andersen 1975–1994
- Alf Anderson 1941–1946
- Allan Anderson 1986–1991
- Andy Anderson 1948–1949
- Bill Anderson 1930–1930
- Bill Anderson 1889–1889
- Bill Anderson 1925–1925
- Bill Anderson 1941–1947
- Bob Anderson 1957–1963
- Bobby Anderson 1920–1920
- Brady Anderson 1988–2002
- Brett Anderson 2009–2021
- Brian Anderson 2005–2009
- Brian Anderson 2017–2024
- Brian Anderson 1993–2005
- Bryan Anderson 2010–2015
- Bubbles Anderson 1922–1925
- Bud Anderson 1982–1983
- C. Anderson 1920–1920
- Chase Anderson 2014–2024
- Cody Anderson 2015–2019
- Craig Anderson 1961–1964
- Dave Anderson 1889–1890
- Dave Anderson 1983–1992
- Drew Anderson 2017–2021
- Drew Anderson 2006–2006
- Dwain Anderson 1971–1974
- Fast Ball Anderson 1938–1938
- Ferrell Anderson 1946–1953
- Fred Anderson 1909–1918
- Garret Anderson 1994–2010
- George Anderson 1914–1918
- Goat Anderson 1907–1907
- Grant Anderson 2023–2025
- Hal Anderson 1932–1932
- Harry Anderson 1957–1961
- Ian Anderson 2020–2025
- Jason Anderson 2003–2005
- Jim Anderson 1978–1984
- Jimmy Anderson 1999–2004
- John Anderson 1894–1908
- John Anderson 1958–1962
- Josh Anderson 2007–2009
- Justin Anderson 2018–2024
- Kent Anderson 1989–1990
- Larry Anderson 1974–1977
- Lars Anderson 2010–2012
- Lewis Anderson 1930–1933
- Marlon Anderson 1998–2009
- Matt Anderson 1998–2005
- Mike Anderson 1993–1993
- Mike Anderson 1971–1979
- Nick Anderson 2019–2025
- Orinthal Anderson 1947–1947
- Red Anderson 1937–1941
- Rick Anderson 1986–1988
- Rick Anderson 1979–1980
- Roland Anderson 1944–1944
- Scott Anderson 1987–1995
- Shaun Anderson 2019–2025
- Sparky Anderson 1959–1959
- Tanner Anderson 2018–2021
- Tim Anderson 2016–2025
- Tyler Anderson 2016–2025
- Varney Anderson 1889–1896
- Walter Anderson 1917–1919
- Wingo Anderson 1910–1910
- ander01 1938–1938
- Robert Andino 2005–2016
- Steve Andrade 2006–2006
- John Andre 1955–1955
- John Andreoli 2018–2021
- Ernie Andres 1946–1946
- Kim Andrew 1975–1975
- Clayton Andrews 2023–2024
- Clayton Andrews 2000–2000
- Curley Andrews 1943–1944
- Ed Andrews 1884–1891
- Elbert Andrews 1925–1925
- Fred Andrews 1976–1977
- Hub Andrews 1947–1948
- Ivy Andrews 1931–1938
- Jabbo Andrews 1930–1942
- Jim Andrews 1890–1890
- John Andrews 1973–1973
- Mike Andrews 1966–1973
- Nate Andrews 1937–1946
- Pop Andrews 1905–1914
- Rob Andrews 1975–1979
- Shane Andrews 1995–2002
- Stan Andrews 1939–1945
- Wally Andrews 1884–1888
- andre01 1939–1939
- andre02 1938–1938
- Matt Andriese 2015–2024
- Bill Andrus 1931–1937
- Elvis Andrus 2009–2023
- Fred Andrus 1876–1884
- Wyman Andrus 1885–1885
- Joaquin Andujar 1976–1988
- Luis Andujar 1995–1998
- Miguel Andujar 2017–2025
- Norm Angelini 1972–1973
- Matt Angle 2011–2011
- Tom Angley 1929–1929
- Pat Ankenman 1936–1944
- Rick Ankiel 1999–2013
- Dean Anna 2014–2015
- Bill Annis 1884–1884
- Cap Anson 1871–1897
- Eric Anthony 1989–1997
- Roman Anthony 2025–2025
- Joe Antolick 1944–1944
- Dustin Antolin 2016–2016
- Tejay Antone 2020–2024
- John Antonelli 1944–1945
- Johnny Antonelli 1948–1961
- Matt Antonelli 2008–2008
- Bill Antonello 1953–1953
- Nori Aoki 2012–2017
- Luis Aparicio 1956–1973
- Bob Apodaca 1973–1977
- Luis Aponte 1980–1984
- Sherten Apostel 2020–2020
- Mark Appel 2022–2022
- Kevin Appier 1989–2004
- Fred Applegate 1904–1904
- Gideon Applegate 1945–1945
- Red Applegate 1947–1947
- Ed Appleton 1915–1916
- Pete Appleton 1927–1945
- Luke Appling 1930–1950
- Aristides Aquino 2018–2022
- Greg Aquino 2004–2009
- Jayson Aquino 2016–2017
- Luis Aquino 1986–1995
- Angel Aragon 1914–1917
- Jack Aragon 1941–1941
- Jonathan Aranda 2022–2025
- Pedro Arango 1925–1939
- Victor Arano 2017–2022
- Elvis Araujo 2015–2016
- Pedro Araujo 2018–2019
- Jonathan Arauz 2020–2023
- Maurice Archdeacon 1923–1925
- Chris Archer 2012–2022
- Fred Archer 1936–1937
- Jim Archer 1961–1962
- Jimmy Archer 1904–1918
- Luke Archer 1920–1922
- George Archie 1938–1946
- Francisco Arcia 2018–2018
- Jose Arcia 1968–1970
- Orlando Arcia 2016–2025
- Oswaldo Arcia 2013–2016
- Dan Ardell 1961–1961
- Rugger Ardizoia 1947–1947
- Joe Ardner 1884–1890
- Danny Ardoin 2000–2008
- Frank Arellanes 1908–1910
- Nolan Arenado 2013–2025
- J. P. Arencibia 2010–2015
- Mario Arencibia 1948–1948
- Hank Arft 1948–1952
- Alberto Arias 2007–2009
- Alex Arias 1992–2002
- Gabriel Arias 2022–2025
- George Arias 1996–1999
- Joaquin Arias 2006–2015
- Luarbert Arias 2025–2025
- Rudy Arias 1959–1959
- Kohei Arihara 2021–2022
- Mario Ariosa 1947–1947
- Buzz Arlett 1931–1931
- Don Arlich 1965–1966
- Steve Arlin 1969–1974
- Felipe Armas 1925–1925
- Marcos Armas 1993–1993
- Tony Armas 1976–1989
- Tony Armas 1999–2008
- Ed Armbrister 1973–1977
- Orville Armbrust 1934–1934
- Charlie Armbruster 1905–1907
- Harry Armbruster 1906–1906
- Pablo Armenteros 1916–1916
- Rogelio Armenteros 2019–2019
- Buddy Armour 1933–1947
- armou01 1947–1947
- Jimmie Armstead 1938–1946
- George Armstrong 1946–1946
- Howard Armstrong 1911–1911
- Jack Armstrong 1988–1994
- Mike Armstrong 1980–1987
- Mule Armstrong 1913–1913
- Robert Armstrong 1871–1871
- Shawn Armstrong 2015–2025
- Harry Arndt 1902–1907
- Larry Arndt 1989–1989
- Billy Arnold 1872–1872
- Chris Arnold 1971–1976
- Jamie Arnold 1999–2000
- Paul Arnold 1926–1936
- Scott Arnold 1988–1988
- Tony Arnold 1986–1987
- Morrie Arnovich 1936–1946
- Brad Arnsberg 1986–1992
- Orie Arntzen 1943–1943
- Jonathan Aro 2015–2016
- Rene Arocha 1993–1997
- Randy Arozarena 2019–2025
- Luis Arraez 2019–2025
- Jose Arredondo 2008–2012
- Jake Arrieta 2010–2021
- Spencer Arrighetti 2024–2025
- Gerry Arrigo 1961–1970
- Rolando Arrojo 1998–2002
- Bronson Arroyo 2000–2017
- Christian Arroyo 2017–2023
- Fernando Arroyo 1975–1986
- Luis Arroyo 1955–1963
- Rudy Arroyo 1971–1971
- Erisbel Arruebarrena 2014–2014
- Humberto Arteaga 2019–2021
- artez01 1945–1945
- arthu01 1925–1925
- Joaquín Arumís 1920–1920
- Harry Arundel 1875–1884
- Tug Arundel 1882–1888
- Randy Asadoor 1986–1986
- Jim Asbell 1938–1938
- Casper Asbjornson 1928–1932
- Orlando Asbury 1924–1924
- Carlos Ascanio 1946–1946
- Jose Ascanio 2007–2011
- Cody Asche 2013–2017
- Jairo Asencio 2009–2013
- Miguel Asencio 2002–2006
- Ken Ash 1925–1930
- Rudolph Ash 1920–1926
- Richie Ashburn 1948–1962
- Aaron Ashby 2021–2025
- Alan Ashby 1973–1989
- Andy Ashby 1991–2004
- Earl Ashby 1945–1948
- Braxton Ashcraft 2025–2025
- Graham Ashcraft 2022–2025
- Alec Asher 2015–2018
- Tucker Ashford 1976–1984
- Billy Ashley 1992–1998
- Nevin Ashley 2015–2015
- Tom Asmussen 1907–1907
- Bob Aspromonte 1956–1971
- Ken Aspromonte 1957–1963
- Javier Assad 2022–2025
- Brian Asselstine 1976–1981
- Paul Assenmacher 1986–1999
- Ezequiel Astacio 2005–2006
- Pedro Astacio 1992–2006
- Barrett Astin 2017–2017
- Joe Astroth 1945–1956
- Willians Astudillo 2018–2022
- Carlos Asuaje 2016–2018
- Scott Atchison 2004–2015
- Justin Atchley 2001–2001
- Charlie Atherton 1899–1899
- Keith Atherton 1983–1989
- Luis Atilano 2010–2010
- Abe Atkins 1923–1923
- Garrett Atkins 2003–2010
- James Atkins 1950–1952
- Joe Atkins 1944–1947
- Mitch Atkins 2009–2011
- Tommy Atkins 1909–1910
- Al Atkinson 1884–1887
- Bill Atkinson 1976–1979
- Ed Atkinson 1873–1873
- Harry Atkinson 1895–1895
- Lefty Atkinson 1927–1927
- atkin01 1941–1941
- Dick Attreau 1926–1927
- Toby Atwell 1952–1956
- Bill Atwood 1936–1940
- Jake Atz 1902–1909
- Harry Aubrey 1903–1903
- Michael Aubrey 2008–2009
- Derek Aucoin 1996–1996
- Rich Aude 1993–1996
- Rick Auerbach 1971–1981
- Bryan Augenstein 2009–2011
- Don August 1988–1991
- Dave Augustine 1973–1974
- Jerry Augustine 1975–1984
- Clyde Augustus 1927–1927
- Cornelius Augustus 1937–1937
- Elden Auker 1933–1942
- Tex Aulds 1947–1947
- Doug Ault 1976–1980
- Phillippe Aumont 2012–2015
- Rich Aurilia 1995–2009
- Joe Ausanio 1994–1995
- Brad Ausmus 1993–2010
- Dennis Aust 1965–1966
- Frank Austin 1944–1948
- Henry Austin 1873–1873
- Jeff Austin 2001–2003
- Jim Austin 1991–1993
- Jimmy Austin 1909–1929
- Oscar Austin 1932–1932
- Raymond Austin 1930–1930
- Rick Austin 1970–1976
- Tyler Austin 2016–2019
- austi01 1932–1932
- Al Autry 1976–1976
- Chick Autry 1907–1909
- Martin Autry 1924–1930
- Drew Avans 2025–2025
- Abiatal Avelino 2018–2019
- Bruce Aven 1997–2002
- Earl Averill 1956–1963
- Earl Averill 1929–1941
- Skip Avery 1948–1948
- Steve Avery 1990–2003
- Xavier Avery 2012–2012
- Alex Avila 2009–2021
- Bobby Avila 1949–1959
- Luinder Avila 2025–2025
- Nick Avila 2024–2024
- Pedro Avila 2019–2024
- Luis Avilan 2012–2021
- Mike Aviles 2008–2017
- Ramon Aviles 1977–1981
- Jay Avrea 1950–1950
- Russell Awkard 1940–1941
- Dylan Axelrod 2011–2015
- John Axford 2009–2021
- Benny Ayala 1974–1985
- Bobby Ayala 1992–1999
- Luis Ayala 2003–2013
- Erick Aybar 2006–2017
- Manny Aybar 1997–2005
- Willy Aybar 2005–2010
- Jake Aydelott 1884–1886
- Bill Ayers 1947–1947
- Doc Ayers 1913–1921
- Dick Aylward 1953–1953
- Bob Ayrault 1992–1993
- Joe Ayrault 1996–1996
- Joe Azcue 1960–1972
- Jose Azocar 2022–2025
- Oscar Azocar 1990–1992
- Alejandro De Aza 2007–2017
- Clay Van Alstyne 1927–1928
- Russ Van Atta 1933–1939