- Danys Báez, P (World), 2000
- Pedro Báez, 3B (World), 2009
- Homer Bailey, P (U.S.), 2006
- Brad Baker, P (U.S.), 2002
- Wladimir Balentien, OF (World), 2006–2007
- Collin Balester, P (U.S.), 2007
- Grant Balfour, P (World), 2001
- Manny Bañuelos, P (World), 2009
- Josh Barfield, IF (U.S.), 2003, 2005
- Daric Barton, 1B (U.S.), 2005
- Denny Bautista, P (World), 2003
- Pedro Beato, P (World), 2007
- Josh Beckett, P (U.S.), 2000
- Erik Bedard, P (World), 2001–2002
- Francis Beltrán, P (World), 2002
- Peter Bergeron, OF (U.S.), 1999
- William Bergolla, 2B (World), 2005
- Lance Berkman, OF (U.S.), 1999
- Angel Berroa, IF (World), 2001, 2002
- Yuniesky Betancourt, SS (World), 2005
- Wilson Betemit, IF (World), 2001
- Travis Blackley, P (World), 2003
- Hank Blalock, IF (U.S.), 2001
- Andrés Blanco, IF (World), 2004
- Tony Blanco, OF (World), 2004
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- Joe Blanton, P (U.S.), 2004
- Brian Bocock, IF (U.S.), 2007
- Emilio Bonifacio, IF (World), 2008
- Joe Borchard, OF (U.S.), 2001–2002
- Travis Bowyer, P (U.S.), 2005
- Ryan Braun, IF (U.S.), 2006
- Bobby Bradley, P (U.S.), 2000
- Russell Branyan, IF (U.S.), 1999
- Dee Brown, OF (U.S.), 1999
- Jay Bruce, OF (U.S.), 2007
- Clay Buchholz, P (U.S.), 2007
- John Buck, C (U.S.), 2002
- Travis Buck, OF (U.S.), 2006
- Mark Buehrle, P (U.S.), 2000
- Bryan Bullington, P (U.S.), 2004
- Madison Bumgarner, P (U.S.), 2009
- Chris Burke, IF (U.S.), 2003–2004
- A.J. Burnett, P (U.S.), 1999
- Sean Burnett, P (U.S.), 2002
- Pat Burrell, IF (U.S.), 1999
- Sean Burroughs, 3B (U.S.), 2000–2001
- Billy Butler, OF (U.S.), 2006
- Brent Butler, IF (U.S.), 2001
- Marlon Byrd, OF (U.S.), 2002
- Mike Bynum, P (U.S.), 2000
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