- Aaron, Hank
- Aaron, Tommy
- Abbott, Paul
- Abdul-Jabbar, Kareem
- Abdullah, Rabih
- Abdullah, Rahim
- Abdur-Rahim, Shareef
- Abernathy, Brent
- Abraham, John
- Abrahamian, Ara
- Abreu, Bobby
- Abrosimova, Svetlana
- Acevedo, Jose
- Acevedo, Juan
- Adams, Anthony
- Adams, Craig
- Adams, Flozell
- Adams, Greg
- Adams, Kevin
- Adams, Kevyn
- Adams, Sam
- Adams, Terry
- Adderley, Herb
- Adibi, Xavier
- Aebischer, David
- Afinogenov, Maxim
- Agassi, Andre
- Agbayani, Benny
- Agoos, Jeff
- Akers, David
- Albright, Chris
- Alexander, Brent
- Alexander, Courtney
- Alexander, Derrick
- Alexander, Keith
- Alexander, Shaun
- Alexander, Stephen
- Alfonseca, Antonio
- Alfredsson, Daniel
- Alfredsson, Helen
- Alicea, Luis
- Allan, Steve
- Allem, Fulton
- Allen, Brian
- Allen, Bryan
- Allen, David
- Allen, Eric
- Allen, James
- Allen, Larry
- Allen, Matt
- Allen, Michael
- Allen, Ray
- Allen, Taje
- Allison, Jason
- Allred, John
- Alomar, Roberto
- Alomar, Sandy
- Alou, Moises
- Alston, Rafer
- Alston, Walter
- Alstott, Mike
- Alvarez, Pedro
- Amato, Chuck
- Ambrose, Ashley
- Ames, Stephen
- Amonte, Tony
- Anderson, Bennie
- Anderson, Brady
- Anderson, Brian
- Anderson, Cheryl
- Anderson, Chris
- Anderson, Deon
- Anderson, Derek
- Anderson, Garret
- Anderson, Gary
- Anderson, Jamal
- Anderson, Jimmy
- Anderson, Kenny
- Anderson, Mark
- Anderson, Marlon
- Anderson, Matt
- Anderson, Mike
- Anderson, Nick
- Anderson, Richie
- Anderson, Shandon
- Anderson, Sparky
- Anderson, Willie
- Andrade, Billy
- Andretti, John
- Andretti, Marco
- Andretti, Mario
- Andretti, Michael
- Andrews, Donna
- Andruzzi, Joe
- Anelka, Nicolas
- Anson, Cap
- Anthony, David
- Anthony, Greg
- Anthony, Reidel
- Antropov, Nik
- Aoki, Isao
- Aparicio, Luis
- Appier, Kevin
- Appleby, Stuart
- Appling, Luke
- Archer, George
- Archuleta, Adam
- Ardoin, Danny
- Arenas, Gilbert
- Ariza, Trevor
- Arkhipov, Denis
- Armas, Chris
- Armas, Tony
- Armour III, Tommy
- Armstead, Jessie
- Armstrong, Cole
- Armstrong, Darrell
- Armstrong, Derek
- Armstrong, Hilton
- Armstrong, Trace
- Arnott, Jason
- Arrojo, Rolando
- Arroyo, Carlos
- Artest, Ron
- Ascanio, Jose
- Asham, Arron
- Ashburn, Richie
- Ashe, Arthur
- Ashworth, Tom
- Atkins, Chucky
- Atkins, Doug
- Atwal, Arjun
- Aucoin, Adrian
- Augmon, Stacey
- Auriemma, Geno
- Ausmus, Brad
- Austin, Billy
- Austin, Jeff
- Austin, Reggie
- Austin, Tracy
- Austin, Woody
- Autry, Darnell
- Averill, Earl
- Avery, John
- Avery, Sean
- Avery, William
- Axelsson, P.J.
- Ayanbadejo, Brendon
- Ayanbadejo, Obafemi
- Aybar, Erick
- Azinger, Paul
- Azumah, Jerry