Player Draft
| Name | State | School | Class | Pos. | Year | Round | Team |
| Reid Birlingmair | IL | Normal West | 2015 | SS | 2018 | 28 | Athletics |
| Braylon Bishop | AR | Texarkana Arkansas | 2021 | OF | 2021 | 14 | Pirates |
| Eric Bitonti | CA | Aquinas | 2023 | 3B | 2023 | 3 | Brewers |
| Nick Bitsko | PA | Central Bucks East | 2020 | RHP | 2020 | 1 | Rays |
| Jake Bivens | MI | Battle Creek Lakeview | 2014 | SS | 2017 | 27 | Tigers |
| Tyler Black | ON | St. Andrews | 2018 | 2B | 2021 | 1 | Milwaukee Brewers |
| Mason Black | PA | Valley View | 2018 | RHP | 2021 | 3 | Giants |
| Nick Blackburn | IL | Neuqua Valley | 2012 | RHP | 2016 | 16 | Diamondbacks |
| Bradley Blalock | GA | Grayson | 2019 | RHP | 2019 | 32 | Boston Red Sox |
| Travis Blankenhorn | PA | Pottsville Area | 2015 | SS | 2015 | 3 | Twins |
| Brock Blatter | MT | Billings Central Catholic | 2022 | RHP | 2022 | 19 | Cubs |
| Adam Bleday | PA | Titusville | 2013 | LHP | 2017 | 27 | Astros |
| JJ Bleday | FL | Mosley | 2016 | OF | 2016 | 39 | Padres |
| Scott Blewett | NY | Charles W Baker | 2014 | RHP | 2014 | 2 | Royals |
| Ryan Bliss | GA | Troup County | 2018 | SS | 2018 | 30th | Red Sox |
| Tyler Blohm | MD | Archbishop Spalding | 2016 | LHP | 2016 | 17 | Orioles |
| Jake Bloss | NC | Grimsley | 2019 | RHP | 2023 | 3 | Astros |
| AJ Blubaugh | OH | Clear Fork | 2019 | RHP | 2022 | 7 | Astros |
| Scott Boches | PA | Archbishop Wood | 2013 | RHP | 2017 | 30 | Mariners |
| Austin Bodrato | NJ | St. Joseph's Regional | 2016 | RHP | 2016 | 24 | Pirates |
| Jeff Boehm | IL | Mount Carmel | 2011 | OF | 2015 | 13 | Angels |
| Mike Boeve | NE | Hastings | 2020 | 3B | 2023 | 2 | Brewers |
| Branden Boggetto | IL | Providence Catholic | 2012 | SS | 2016 | 25 | Nationals |
| A.J. Bogucki | PA | Boyertown Area | 2013 | RHP | 2016 | 8 | Nationals |
| Cody Bohanek | IL | Marist | 2013 | SS | 2017 | 30 | Astros |
| Jace Bohrofen | OK | Westmoore | 2020 | OF | 2023 | 6 | Blue Jays |
| Caleb Bolden | TX | Pleasant Grove | 2017 | RHP | 2022 | 7 | Red Sox |
| Henry Bolte | CA | Palo Alto | 2022 | OF | 2022 | 2 | OAK |
| Brett Bond | MO | Westminster | 2014 | C | 2017 | 23 | Astros |
| Aaron Bond | IN | Clay High School | 2015 | OF | 2017 | 12 | Giants |
| Bo Bonds | FL | Suwannee | 2019 | RHP | 2022 | 13 | Blue Jays |
| Paul Bonzagni | TX | Southlake Carroll | 2020 | RHP | 2023 | 12 | Rangers |
| Timmy Borden | IN | Providence | 2018 | SS | 2022 | 16 | Astros |
| Matthew Borens | IL | Peotone | 2011 | RHP | 2014 | 11 | Yankees |
| Joshua Bortka | KS | Turner | 2018 | RHP | 2022 | 16 | Phillies |
| Ryan Borucki | IL | Mundelein | 2012 | LHP | 2012 | 15 | Blue Jays |
| Ethan Bosacker | MN | Monticello | 2019 | RHP | 2023 | 13 | Royals |
| Jacob Bosiokovic | OH | Delaware Hayes | 2012 | 3B | 2016 | 19 | Rockies |
| Julian Bosnic | FL | Berkely Prep | 2018 | LHP | 2022 | 14 | Pirates |
| Brandon Bossard | IL | Nazareth | 2016 | SS | 2016 | 31 | White Sox |
| Austin Bossart | IL | O'Fallon | 2011 | C | 2015 | 14 | Phillies |
| Joshua Bostick | TX | McKinney | 2020 | RHP | 2023 | 8 | Giants |
| Adam Boucher | NJ | St. Joseph's Metuchen | 2020 | RHP | 2023 | 10 | Rays |
| Kristofer Bow | NV | Centennial | 2019 | RHP | 2022 | 14 | Yankees |
| Ben Bowden | MA | Lynn English | 2013 | LHP | 2016 | 2 | Rockies |
| Jase Bowen | OH | Central Catholic | 2019 | OF | 2019 | 11th | Pittsburgh Pirates |
| Darren Bowen | NC | Red Springs | 2019 | RHP | 2022 | 13 | Cardinals |
| Hunter Bowling | FL | American Heritage | 2015 | LHP | 2015 | 39 | Giants |
| Drew Bowser | CA | Harvard-Westlake | 2020 | 3B | 2023 | 20 | Cubs |
| Riley Boyd | MO | Eldorado Springs | 2017 | RHP | 2019 | 28 | Royals |
| Justin Boyd | CO | Legend | 2019 | OF | 2022 | CBB | Reds |
| Jeremiah Boyd | NC | Hickory Ridge | 2018 | C | 2018 | 35 | Boston Red Sox |
| Emaarion Boyd | MS | South Panola High School | 2022 | OF | 2022 | 11 | Phillies |
| Enrique Bradfield Jr | FL | American Heritage Plantation | 2020 | OF | 2023 | 1 | Orioles |
| Taj Bradley | GA | Redan | 2018 | OF | 2018 | 5th | Rays |
| Davis Bradshaw | MS | McLaurin | 2017 | OF | 2018 | 11th | Marlins |
| Denny Brady | NJ | Buena | 2015 | RHP | 2017 | 7 | Los Angeles Angels |
| Braxton Bragg | MO | Liberty | 2019 | 1B | 2023 | 8 | Orioles |
| Kade Bragg | TX | Ennis | 2019 | LHP | 2023 | 17 | Twins |
| Trey Braithwaite | VA | Millbrook | 2016 | RHP | 2022 | 16 | Reds |
| Jonathan Brand | GA | Columbus | 2018 | RHP | 2022 | 8 | Red Sox |
| Connor Brandon | OH | Watkins Memorial | 2019 | RHP | 2022 | 17 | Mets |
| Jack Brannigan | IL | Marist | 2019 | RHP | 2022 | 3 | Pirates |
| Brooks Brannon | NC | Randleman | 2022 | C | 2022 | 9 | Red Sox |
| Mitch Bratt | ON | Newmarket | 2021 | LHP | 2021 | 5 | Texas Rangers |
| Ben Brecht | IL | New Trier | 2016 | LHP | 2019 | 5 | Rays |
| Bradley Brehmer | IN | Decatur Central | 2018 | RHP | 2022 | 12 | Orioles |
| Dondrae Bremner | ON | Bill Crothers | 2017 | SS | 2017 | 31 | Reds |
| Tim Brennan | PA | Holy Ghost Prep | 2015 | RHP | 2018 | 7 | Rangers |
| Will Brennan | KS | Blue Valley | 2016 | RHP | 2019 | 8 | Indians |
| Jacob Brentz | MO | Parkway South | 2013 | LHP | 2013 | 11 | Blue Jays |
| Jacob Bresnahan | WA | Sumner | 2023 | LHP | 2023 | 13 | Guardians |
| Michael Brettell | ON | E.L.Crossley Secondary School | 2015 | RHP | 2018 | 15 | St. Louis Cardinals |
| Sean Bretz | LA | John Curtis | 2016 | RHP | 2019 | 15th | Royals |
| Beau Brewer | TX | McKinney Boyd | 2020 | 3B | 2022 | 19 | Yankees |
| Michael Brewer | MO | Hillsboro | 2019 | RHP | 2019 | 32 | Rangers |
| Cody Brickhouse | FL | Sarasota | 2015 | 3B | 2015 | 15 | Giants |
| Spencer Brickhouse | NC | Bunn | 2016 | 1B | 2019 | 7 | Arizona Diamondbacks |
| Drew Bridges | MO | Carthage | 2013 | 1B | 2013 | 20 | Yankees |
| Trace Bright | AL | Trinity Presbyterian | 2019 | C | 2022 | 5 | Orioles |
| Matt Brill | IL | Moline | 2013 | OF | 2017 | 12 | Diamondbacks |
| Clark Brinkman | IL | Immaculate Conception | 2014 | OF | 2018 | 32 | Tigers |
| Serafino Brito | NJ | Indian Hills | 2015 | RHP | 2019 | 28 | Cleveland Indians |
| Logan Britt | TX | Colleyville Heritage | 2019 | OF | 2023 | 17 | Angels |
| Zach Britton | IN | Batesville | 2017 | C | 2020 | 5 | Blue Jays |
| Rio Britton | CA | Capital Christian | 2020 | LHP | 2023 | 15 | Diamondbacks |
| Julian Brock | TX | Fulshear | 2019 | C | 2023 | 8 | Rangers |
| TJ Brock | OH | Cincinnati Country Day School | 2018 | RHP | 2022 | 6 | Blue Jays |
| Colin Brockhouse | IN | Northrop | 2014 | SS | 2017 | 24 | Blue Jays |
| Bryan Broecker | IL | Notre Dame | 2020 | C | 2023 | 13 | Rays |
| Jake Brooks | CA | Fountain Valley | 2020 | RHP | 2023 | 11 | Marlins |
| Matthew Brosky | OH | Strongsville | 2018 | RHP | 2022 | 8 | Rangers |
| Blake Brown | IL | Normal West | 2009 | OF | 2012 | 5 | Braves |
| Zack Brown | IN | Seymour | 2013 | RHP | 2016 | 5 | Brewers |
| Cassidy Brown | OH | Walsh Jesuit | 2013 | C | 2016 | 12 | Reds |
| Nathan Brown | WI | Arrowhead | 2016 | RHP | 2016 | 40 | Yankees |
| Tyler Brown | OH | Olentangy Orange | 2017 | RHP | 2017 | 26 | Reds |
| Ben Brown | NY | Ward Melville | 2017 | RHP | 2017 | 33rd | Philadelphia Phillies |
| Jaden Brown | ON | St. Marcellinus | 2019 | SS | 2019 | 40 | Washington Nationals |
| Dasan Brown | ON | Abbey Park | 2019 | OF | 2019 | 3 | Toronto Blue Jays |