A
Bold indicates Hall of Famer.
*Indicates active as of 2008.
| David Aardsma | 2004-2007 |
| Hank Aaron | 1954-1976 |
| Tommie Aaron | 1962-1971 |
| Don Aase | 1977-1990 |
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| Andy Abad | 2001-2006 |
| John Abadie | 1875-1875 |
| Ed Abbaticchio | 1897-1910 |
| Bert Abbey | 1892-1896 |
| Charlie Abbey | 1893-1897 |
| Dan Abbott | 1890-1890 |
| Fred Abbott | 1903-1905 |
| Glenn Abbott | 1973-1984 |
| Jeff Abbott | 1997-2001 |
| Jim Abbott | 1989-1999 |
| Kurt Abbott | 1993-2001 |
| Kyle Abbott | 1991-1996 |
| Ody Abbott | 1910-1910 |
| Paul Abbott | 1990-2004 |
| Al Aber | 1950-1957 |
| Francis Abercrombie | 1871-1871 |
| Reggie Abercrombie | 2006-2007 |
| Bill Abernathie | 1952-1952 |
| Brent Abernathy | 2001-2005 |
| Tal Abernathy | 1942-1944 |
| Ted Abernathy | 1955-1972 |
| Woody Abernathy | 1946-1947 |
| Cliff Aberson | 1947-1949 |
| Harry Ables | 1905-1911 |
| Shawn Abner | 1987-1992 |
| Cal Abrams | 1949-1956 |
| George Abrams | 1923-1923 |
| Johnny Abrego | 1985-1985 |
| Bobby Abreu | 1996-2007 |
| Joe Abreu | 1942-1942 |
| Tony Abreu | 2007-2007 |
| Winston Abreu | 2006-2007 |
| Bill Abstein | 1906-1910 |
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| Jeremy Accardo | 2005-2007 |
| Jose Acevedo | 2001-2005 |
| Juan Acevedo | 1995-2003 |
| Jim Acker | 1983-1992 |
| Tom Acker | 1956-1959 |
| Fritz Ackley | 1963-1964 |
| Cy Acosta | 1972-1975 |
| Ed Acosta | 1970-1972 |
| Jose Acosta | 1920-1922 |
| Manny Acosta | 2007-2007 |
| Merito Acosta | 1913-1918 |
| Mark Acre | 1994-1997 |
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| Jerry Adair | 1958-1970 |
| Jimmy Adair | 1931-1931 |
| Ace Adams | 1941-1946 |
| Babe Adams | 1906-1926 |
| Bert Adams | 1910-1919 |
| Bob Adams | 1925-1925 |
| Bob Adams | 1931-1932 |
| Bobby Adams | 1946-1959 |
| Bob Adams | 1977-1977 |
| Buster Adams | 1939-1947 |
| Dan Adams | 1914-1915 |
| Dick Adams | 1947-1947 |
| Doug Adams | 1969-1969 |
| George Adams | 1879-1879 |
| Glenn Adams | 1975-1982 |
| Herb Adams | 1948-1950 |
| Jim Adams | 1890-1890 |
| Joe Adams | 1902-1902 |
| Joel Adamson | 1996-1998 |
| Karl Adams | 1914-1915 |
| Mike Adamson | 1967-1969 |
| Mike Adams | 1972-1978 |
| Mike Adams | 2004-2006 |
| Red Adams | 1946-1946 |
| Rick Adams | 1905-1905 |
| Ricky Adams | 1982-1985 |
| Russ Adams | 2004-2007 |
| Sparky Adams | 1922-1934 |
| Spencer Adams | 1923-1927 |
| Terry Adams | 1995-2005 |
| Willie Adams | 1912-1919 |
| Willie Adams | 1996-1997 |
| Joe Adcock | 1950-1966 |
| Bob Addis | 1950-1953 |
| Jim Adduci | 1983-1989 |
| Bob Addy | 1871-1877 |
| Morrie Aderholt | 1939-1945 |
| Dewey Adkins | 1942-1949 |
| Dick Adkins | 1942-1942 |
| Doc Adkins | 1902-1903 |
| Grady Adkins | 1928-1929 |
| Henry Adkinson | 1895-1895 |
| Jon Adkins | 2003-2007 |
| Steve Adkins | 1990-1990 |
| Dave Adlesh | 1963-1968 |
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| Troy Afenir | 1987-1992 |
| Jeremy Affeldt | 2002-2007 |
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| Benny Agbayani | 1998-2002 |
| Tommie Agee | 1962-1973 |
| Harry Agganis | 1954-1955 |
| Joe Agler | 1912-1915 |
| Sam Agnew | 1913-1919 |
| Juan Agosto | 1981-1993 |
| Luis Aguayo | 1980-1989 |
| Chris Aguila | 2004-2006 |
| Rick Aguilera | 1985-2000 |
| Hank Aguirre | 1955-1970 |
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| Charlie Ahearn | 1880-1880 |
| Pat Ahearne | 1995-1995 |
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| Willie Aikens | 1977-1985 |
| Danny Ainge | 1979-1981 |
| Eddie Ainsmith | 1910-1924 |
| Kurt Ainsworth | 2001-2004 |
| Raleigh Aitchison | 1911-1915 |
| George Aiton | 1912-1912 |
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| John Ake | 1884-1884 |
| Darrel Akerfelds | 1986-1991 |
| Jack Aker | 1964-1974 |
| Bill Akers | 1929-1932 |
| Jerry Akers | 1912-1912 |
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| Joey Amalfitano | 1954-1967 |
| Rich Amaral | 1991-2000 |
| Ruben Amaro | 1958-1969 |
| Ruben Amaro | 1991-1998 |
| Wayne Ambler | 1937-1939 |
| Chip Ambres | 2005-2007 |
| Ed Amelung | 1984-1986 |
| Red Ames | 1903-1919 |
| Alfredo Amezaga | 2002-2007 |
| Doc Amole | 1897-1898 |
| Sandy Amoros | 1952-1960 |
| Vicente Amor | 1955-1957 |
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| Luis Aparicio | 1956-1973 |
| Bob Apodaca | 1973-1977 |
| Luis Aponte | 1980-1984 |
| Kevin Appier | 1989-2004 |
| Ed Appleton | 1915-1916 |
| Fred Applegate | 1904-1904 |
| Pete Appleton | 1927-1945 |
| Luke Appling | 1930-1950 |
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| Greg Aquino | 2004-2007 |
| Luis Aquino | 1986-1995 |
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| Randy Asadoor | 1986-1986 |
| Jim Asbell | 1938-1938 |
| Casper Asbjornson | 1928-1932 |
| Jose Ascanio | 2007-2007 |
| Miguel Asencio | 2002-2006 |
| Richie Ashburn | 1948-1962 |
| Alan Ashby | 1973-1989 |
| Andy Ashby | 1991-2004 |
| Tucker Ashford | 1976-1984 |
| Ken Ash | 1925-1930 |
| Billy Ashley | 1992-1998 |
| Tom Asmussen | 1907-1907 |
| Bob Aspromonte | 1956-1971 |
| Ken Aspromonte | 1957-1963 |
| Brian Asselstine | 1976-1981 |
| Paul Assenmacher | 1986-1999 |
| Ezequiel Astacio | 2005-2006 |
| Pedro Astacio | 1992-2006 |
| Joe Astroth | 1945-1956 |
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| Scott Atchison | 2004-2007 |
| Justin Atchley | 2001-2001 |
| Charlie Atherton | 1899-1899 |
| Keith Atherton | 1983-1989 |
| Al Atkinson | 1884-1887 |
| Bill Atkinson | 1976-1979 |
| Ed Atkinson | 1873-1873 |
| Garrett Atkins | 2003-2007 |
| James Atkins | 1950-1952 |
| Lefty Atkinson | 1927-1927 |
| Tommy Atkins | 1909-1910 |
| Dick Attreau | 1926-1927 |
| Toby Atwell | 1952-1956 |
| Bill Atwood | 1936-1940 |
| Jake Atz | 1902-1909 |
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| Harry Aubrey | 1903-1903 |
| Derek Aucoin | 1996-1996 |
| Rich Aude | 1993-1996 |
| Rick Auerbach | 1971-1981 |
| Dave Augustine | 1973-1974 |
| Don August | 1988-1991 |
| Jerry Augustine | 1975-1984 |
| Elden Auker | 1933-1942 |
| Leslie Aulds | 1947-1947 |
| Doug Ault | 1976-1980 |
| Rich Aurilia | 1995-2007 |
| Joe Ausanio | 1994-1995 |
| Brad Ausmus | 1993-2007 |
| Dennis Aust | 1965-1966 |
| Henry Austin | 1873-1873 |
| Jeff Austin | 2001-2003 |
| Jimmy Austin | 1909-1929 |
| Jim Austin | 1991-1993 |
| Rick Austin | 1970-1976 |
| Al Autry | 1976-1976 |
| Chick Autry | 1907-1909 |
| Chick Autry | 1924-1930 |
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| Bruce Aven | 1997-2002 |
| Earl Averill | 1929-1941 |
| Earl Averill | 1956-1963 |
| Steve Avery | 1990-2003 |
| Bobby Avila | 1949-1959 |
| Ramon Aviles | 1977-1981 |
| Jay Avrea | 1950-1950 |
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| Benny Ayala | 1974-1985 |
| Bobby Ayala | 1992-1999 |
| Luis Ayala | 2003-2007 |
| Erick Aybar | 2006-2007 |
| Manuel Aybar | 1997-2005 |
| Willy Aybar | 2005-2006 |
| Jake Aydelott | 1884-1886 |
| Bill Ayers | 1947-1947 |
| Doc Ayers | 1913-1921 |
| Dick Aylward | 1953-1953 |
| Bob Ayrault | 1992-1993 |
| Joe Ayrault | 1996-1996 |
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| Joe Azcue | 1960-1972 |
| Oscar Azocar | 1990-1992 |
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