| Name | State | School | Class | Pos. | Commitment |
| Caleb Aaron | IN | Eastern (Greentown) | 2015 | LHP | Owens CC |
| Kadin Abegg | IN | New Prairie | 2017 | RHP | Marian University (IN) |
| Ben Abney | IN | Fishers | 2013 | 1B | Anderson University (IN) |
| Gabe Acevedo | IN | Portage | 2012 | 3B | Western Illinois |
| Josh Adamczewski | IN | Lake Central | 2023 | SS | Ball State |
| Luke Adams | IN | Crown Point | 2017 | SS | Bethel College (IN) |
| Bryce Adams | IN | Noblesville | 2021 | 1B | Saint Francis (IN) |
| Jackson Adams | IN | Carmel | 2019 | 1B | Butler |
| Chas Adams | IN | Floyd Central | 2017 | LHP | Western Kentucky |
| Seth Adams | IN | Greenfield Central | 2015 | 1B | IU-South Bend |
| Brady Adams | IN | Plainfield | 2017 | 1B | Concordia (IL) |
| Cameron Adams | IN | Greensburg | 2020 | RHP | Lincoln Trail JC |
| Baylee Adams | IN | North Montgomery | 2016 | C | Marian University (IN) |
| Evan Aders | IN | Jasper | 2017 | OF | Evansville |
| Aidan Aitken | IN | Carmel | 2021 | RHP | Spokane Falls |
| Luke Albright | IN | Fishers | 2018 | RHP | Kent State |
| Bryce Aldridge | IN | Bloomington North | 2014 | C | Indianapolis |
| Jason All | IN | McCutcheon | 2018 | C | Butler |
| Sawyer Allen | IN | Andrean | 2017 | LHP | Hillsdale College |
| Chase Allen | IN | Vincennes Rivet | 2014 | 2B | Olney Central JC |
| Jadon Ambrose | IN | Heritage Christian | 2018 | - | Cedarville University |
| Logan Ames | IN | Terre Haute South Vigo | 2016 | RHP | St. Joseph's (NY) |
| Alexander Amodeo | IN | Roncalli | 2022 | C | Davis & Elkins College |
| Nick Anderson | IN | Highland | 2018 | C | Kankakee CC |
| Tyler Anderson | IN | Hamilton Heights | 2012 | LHP | Illinois-Chicago |
| Jayden Anderson | IN | Lawrence Central | 2022 | RHP | Taylor University |
| Dominic Anderson | IN | Hagerstown | 2021 | RHP | Eastern Michigan |
| Jacob Anderson | IN | Munster | 2018 | RHP | Rockhurst |
| William Anderson | IN | Columbus East | 2015 | RHP | Northern Illinois |
| Janson Anderson | IN | New Castle | 2018 | 2B | Anderson University (IN) |
| Tanner Andrews | IN | Tippecanoe Valley | 2014 | RHP | Purdue |
| Trevor Ankney | IN | Indian Creek | 2019 | RHP | John A. Logan JC |
| Matthew Annee | IN | Bishop Chatard | 2017 | 3B | Wabash College |
| Noah Arbuckle | IN | Jay County | 2020 | RHP | Hanover College |
| Joel Archer | IN | Floyd Central | 2020 | 1B | John A. Logan JC |
| Philip Archer | IN | Floyd Central | 2016 | 1B | Olney Central JC |
| Alex Archuleta | IN | Evansville North | 2019 | SS | Southern Indiana |
| Jake Armentrout | IN | Wheeler | 2018 | OF | Xavier |
| Jacob Armstrong | IN | Silver Creek | 2012 | RHP | Alabama-Birmingham |
| Patrick Arndt | IN | Chesterton High School | 2016 | C | Chicago State |
| Elias Arnett | IN | Lawrence North | 2013 | OF | Franklin College |
| Drew Ashley | IN | Reitz Memorial | 2017 | OF | Indiana |
| Trent Astle | IN | Jeffersonville | 2013 | LHP | Xavier |
| Andrew Atchison | IN | Crown Point | 2015 | C | Purdue-Calumet |
| Braydon Augustinovicz | IN | Mt. Vernon | 2017 | C | Franklin College |
| Allan Augustus | IN | Lawrence Central | 2018 | OF | Marian University (IN) |
| Aaron Augustus | IN | Lawrence Central | 2015 | OF | Southern Indiana |
| Joe Ault | IN | Homestead | 2014 | SS | Parkland JC |
| Zyon Avery | IN | Ben Davis | 2018 | 1B | Parkland JC |
| Nico Avila | IN | Decatur Central | 2021 | C | Ancilla JC |
| David Ayers | IN | Cathedral | 2023 | SS | Butler |
| Chris Ayers | IN | Westfield | 2015 | OF | Indiana State |
| Danny Ayers | IN | Columbus North | 2013 | LHP | Western Michigan |
| Mitchell Ayers | IN | Bishop Chatard | 2019 | RHP | Indiana Wesleyan |
| Connor Ayers | IN | McCutcheon | 2019 | LHP | Carl Sandburg JC |
| Maguire Ayres | IN | Scecina Memorial | 2019 | RHP | Ball State |
| Jonathan Azar | IN | Munster | 2014 | LHP | DePauw University |
| Sam Bachman | IN | Hamilton Southeastern | 2018 | RHP | Miami (OH) |
| Chris Bachman | IN | Crown Point | 2022 | LHP | Saint Xavier |
| Dalton Back | IN | Columbus East | 2020 | C | Miami (OH) |
| Maverick Bacon | IN | North Montgomery | 2015 | SS | Ball State |
| Caleb Baechtold | IN | Bloomington South | 2012 | C | Johns Hopkins |
| Collin Baer | IN | Elkhart Memorial | 2021 | OF | Anderson University (IN) |
| Devin Bafia | IN | Valparaiso | 2013 | LHP | Evansville |
| Ethan Bailey | IN | Greensburg | 2012 | OF | Earlham College |
| Jacob Bailey | IN | Columbus North | 2021 | OF | Franklin College |
| Brooks Bailey | IN | Hauser | 2015 | 2B | Hanover College |
| Brady Bain | IN | Mooresville | 2016 | C | Wabash Valley JC |
| Isaac Bair | IN | Lapel | 2023 | C | Anderson University (IN) |
| Isaac Bair | IN | Homestead | 2018 | C | Indianapolis |
| Dusty Baird | IN | Perry Meridian | 2016 | RHP | Brown |
| Roman Baisa | IN | North Central | 2014 | OF | Ball State |
| Thaddeus Baker | IN | Manchester | 2021 | 2B | Cornerstone University |
| Tristan Baker | IN | Fishers | 2019 | RHP | Purdue-Northwest |
| Will Baker | IN | Columbus North | 2022 | LHP | Snead State CC |
| Shannon Baker | IN | Northridge | 2013 | C | Purdue - Fort Wayne |
| Brett Baker | IN | Bellmont | 2015 | OF | Franklin College |
| Chris Baker Jr | IN | Heritage | 2021 | C | Indiana Tech |
| Ivan Balboa | IN | Hobart | 2022 | SS | Ivy Tech CC |
| Trey Ball | IN | New Castle | 2013 | LHP | Texas |
| Jeffrey Ballard | IN | Munster | 2019 | LHP | Trine University |
| Ben Balogh | IN | Brebeuf | 2016 | RHP | Anderson University (IN) |
| Nick Bandura | IN | Lake Central High School | 2017 | SS | Indiana Wesleyan |
| Chandler Banic | IN | LaPorte | 2018 | LHP | Ball State |
| Nicholas Banks | IN | Pike | 2019 | SS | Indianapolis |
| Parker Bard | IN | Westfield | 2020 | OF | Dayton |
| Garrison Barile | IN | Center Grove | 2023 | CF | Miami (OH) |
| Kole Barkhaus | IN | Blackhawk Chrisitan | 2017 | RHP | Taylor University |
| Logan Barnes | IN | Taylor | 2013 | SS | Danville Area CC |
| Sammy Barnett | IN | Silver Creek | 2018 | LHP | Indiana |
| Cole Barr | IN | Yorktown | 2017 | 3B | Indiana |
| Lee Barrera | IN | Southside | 2019 | RHP | Ivy Tech CC |
| Jacob Barrett | IN | Castle | 2022 | RHP | Murray State |
| Nick Barrett | IN | Terre Haute North | 2017 | OF | Indiana State |
| Blake Barrett | IN | Floyd Central | 2019 | 1B | Lincoln Trail JC |
| Nick Barrientos | IN | Zionsville | 2012 | CF | Wabash Valley JC |
| Kyle Bartelman | IN | Culver Military Academy | 2013 | MI | Columbia |
| Kyle Bartlemann | IN | Culver Academy | 2013 | SS | Columbia |
| Cole Bartlett | IN | Hagerstown | 2013 | RHP | Missouri |
| Nick Bartolone | IN | Lafayette Harrison | 2012 | OF | Butler |
