189 MLB Players debut on April 12
| # | Player | debut Date |
|---|---|---|
| 1. | R. J. Alaniz | 4/12/2019 |
| 2. | Dana Allison | 4/12/1991 |
| 3. | Hal Anderson | 4/12/1932 |
| 4. | Paul Assenmacher | 4/12/1986 |
| 5. | Howard Bailey | 4/12/1981 |
| 6. | Johnny Bates | 4/12/1906 |
| 7. | Bill Bathe | 4/12/1986 |
| 8. | Peyton Battenfield | 4/12/2023 |
| 9. | Glenn Beckert | 4/12/1965 |
| 10. | Rick Behenna | 4/12/1983 |
| 11. | Pug Bennett | 4/12/1906 |
| 12. | Jim Bethke | 4/12/1965 |
| 13. | Otto Bluege | 4/12/1932 |
| 14. | Joe Boley | 4/12/1927 |
| 15. | Joe Bonikowski | 4/12/1962 |
| 16. | Denis Boucher | 4/12/1991 |
| 17. | John Bowker | 4/12/2008 |
| 18. | Ernie Bowman | 4/12/1961 |
| 19. | Ken Boyer | 4/12/1955 |
| 20. | Taj Bradley | 4/12/2023 |
| 21. | Darren Bragg | 4/12/1994 |
| 22. | Dud Branom | 4/12/1927 |
| 23. | Jeff Branson | 4/12/1992 |
| 24. | Matt Brash | 4/12/2022 |
| 25. | Colten Brewer | 4/12/2018 |
| 26. | Chris Britton | 4/12/2006 |
| 27. | Mark Brouhard | 4/12/1980 |
| 28. | Larry Burright | 4/12/1962 |
| 29. | Jolbert Cabrera | 4/12/1998 |
| 30. | Steve Carlton | 4/12/1965 |
| 31. | Juan Castillo | 4/12/1986 |
| 32. | Ike Caveney | 4/12/1922 |
| 33. | Hunter Cervenka | 4/12/2016 |
| 34. | Danny Clark | 4/12/1922 |
| 35. | Gowell Claset | 4/12/1933 |
| 36. | George Cox | 4/12/1928 |
| 37. | Frankie Crosetti | 4/12/1932 |
| 38. | Wil Culmer | 4/12/1983 |
| 39. | Tony Curry | 4/12/1960 |
| 40. | Babe Danzig | 4/12/1909 |
| 41. | Ray Demmitt | 4/12/1909 |
| 42. | Jimmie DeShong | 4/12/1932 |
| 43. | Jerry Donovan | 4/12/1906 |
| 44. | Jim Duffalo | 4/12/1961 |
| 45. | Sam Dungan | 4/12/1892 |
| 46. | Gary Eave | 4/12/1988 |
| 47. | Dennis Eckersley | 4/12/1975 |
| 48. | Howard Ehmke | 4/12/1915 |
| 49. | Bryce Elder | 4/12/2022 |
| 50. | Clyde Engle | 4/12/1909 |
| 51. | Taylor Featherston | 4/12/2015 |
| 52. | Nate Field | 4/12/2002 |
| 53. | John Flaherty | 4/12/1992 |
| 54. | Van Fletcher | 4/12/1955 |
| 55. | Dan Ford | 4/12/1975 |
| 56. | Pete Fox | 4/12/1933 |
| 57. | Dave Gallagher | 4/12/1987 |
| 58. | Wayne Garrett | 4/12/1969 |
| 59. | Norm Gigon | 4/12/1967 |
| 60. | John Gillespie | 4/12/1922 |
| 61. | Luke Glavenich | 4/12/1913 |
| 62. | Tony Gonzalez | 4/12/1960 |
| 63. | Gene Good | 4/12/1906 |
| 64. | Vean Gregg | 4/12/1911 |
| 65. | Guido Grilli | 4/12/1966 |
| 66. | Heinie Groh | 4/12/1912 |
| 67. | Jeff Grotewold | 4/12/1992 |
| 68. | Stan Hack | 4/12/1932 |
| 69. | Gabby Hartnett | 4/12/1922 |
| 70. | Jim Hibbs | 4/12/1967 |
| 71. | Dennis Higgins | 4/12/1966 |
| 72. | Andy High | 4/12/1922 |
| 73. | Glenn Hoffman | 4/12/1980 |
| 74. | Willie Hogan | 4/12/1911 |
| 75. | Dave Hollins | 4/12/1990 |
| 76. | Newt Hunter | 4/12/1911 |
| 77. | Bruce Hurst | 4/12/1980 |
| 78. | Raisel Iglesias | 4/12/2015 |
| 79. | Scotty Ingerton | 4/12/1911 |
| 80. | Hernan Iribarren | 4/12/2008 |
| 81. | Luis Jimenez | 4/12/2013 |
| 82. | Otis Johnson | 4/12/1911 |
| 83. | Bob Johnson | 4/12/1933 |
| 84. | Edouard Julien | 4/12/2023 |
| 85. | Jakob Junis | 4/12/2017 |
| 86. | Jeff Kent | 4/12/1992 |
| 87. | Dana Kiecker | 4/12/1990 |
| 88. | Bob Kipper | 4/12/1985 |
| 89. | Bill Knickerbocker | 4/12/1933 |
| 90. | Fritz Knothe | 4/12/1932 |
| 91. | Len Koenecke | 4/12/1932 |
| 92. | David Lamb | 4/12/1999 |
| 93. | Fred Lasher | 4/12/1963 |
| 94. | Chris Latham | 4/12/1997 |
| 95. | Tim Leary | 4/12/1981 |
| 96. | Jim Lefebvre | 4/12/1965 |
| 97. | Nemo Leibold | 4/12/1913 |
| 98. | Dutch Leonard | 4/12/1913 |
| 99. | Larry Littleton | 4/12/1981 |
| 100. | Evan Longoria | 4/12/2008 |
| 101. | Art Lopez | 4/12/1965 |
| 102. | Rick Lysander | 4/12/1980 |
| 103. | Pat Mahomes | 4/12/1992 |
| 104. | Brian Mallette | 4/12/2002 |
| 105. | Harry Malmberg | 4/12/1955 |
| 106. | Pat Malone | 4/12/1928 |
| 107. | Yunior Marte | 4/12/2022 |
| 108. | Jose Martinez | 4/12/1969 |
| 109. | Mike Massey | 4/12/1917 |
| 110. | Frank McGowan | 4/12/1922 |
| 111. | Stuffy McInnis | 4/12/1909 |
| 112. | Andrew McKirahan | 4/12/2015 |
| 113. | Joe McManus | 4/12/1913 |
| 114. | Greg McMichael | 4/12/1993 |
| 115. | Norm McMillan | 4/12/1922 |
| 116. | Matt Merullo | 4/12/1989 |
| 117. | Justin Miller | 4/12/2002 |
| 118. | John Mizerock | 4/12/1983 |
| 119. | Joe Moeller | 4/12/1962 |
| 120. | Herb Moford | 4/12/1955 |
| 121. | Willie Montanez | 4/12/1966 |
| 122. | Jordan Montgomery | 4/12/2017 |
| 123. | Randy Moore | 4/12/1927 |
| 124. | Bill Moran | 4/12/1974 |
| 125. | Joseph Morrissey | 4/12/1932 |
| 126. | Peter Moylan | 4/12/2006 |
| 127. | Greasy Neale | 4/12/1916 |
| 128. | Joe Nealon | 4/12/1906 |
| 129. | Gary Neibauer | 4/12/1969 |
| 130. | Adam Oller | 4/12/2022 |
| 131. | Ole Olsen | 4/12/1922 |
| 132. | Ivy Olson | 4/12/1911 |
| 133. | Tom Pagnozzi | 4/12/1987 |
| 134. | Jay Partridge | 4/12/1927 |
| 135. | Roberto Pena | 4/12/1965 |
| 136. | Hank Perry | 4/12/1912 |
| 137. | Bubba Phillips | 4/12/1955 |
| 138. | Chris Rearick | 4/12/2015 |
| 139. | Gerardo Reyes | 4/12/2019 |
| 140. | Pete Richert | 4/12/1962 |
| 141. | Joe Riggert | 4/12/1911 |
| 142. | Topper Rigney | 4/12/1922 |
| 143. | Jeff Robinson | 4/12/1987 |
| 144. | Tommy Romero | 4/12/2022 |
| 145. | Rolando Roomes | 4/12/1988 |
| 146. | Dave Rucker | 4/12/1981 |
| 147. | Jack Saltzgaver | 4/12/1932 |
| 148. | A. J. Schugel | 4/12/2015 |
| 149. | Barney Schultz | 4/12/1955 |
| 150. | George Scott | 4/12/1966 |
| 151. | Diego Segui | 4/12/1962 |
| 152. | Paul Sentell | 4/12/1906 |
| 153. | Norm Sherry | 4/12/1959 |
| 154. | Ralph Shinners | 4/12/1922 |
| 155. | Chick Smith | 4/12/1913 |
| 156. | Jim Smith | 4/12/1982 |
| 157. | Keith Smith | 4/12/1984 |
| 158. | Drew Smyly | 4/12/2012 |
| 159. | Justin Steele | 4/12/2021 |
| 160. | Bill Stellbauer | 4/12/1916 |
| 161. | Bill Swift | 4/12/1932 |
| 162. | Ron Swoboda | 4/12/1965 |
| 163. | Chuck Tanner | 4/12/1955 |
| 164. | Zeb Terry | 4/12/1916 |
| 165. | Jeff Tesreau | 4/12/1912 |
| 166. | Ron Theobald | 4/12/1971 |
| 167. | Bert Tooley | 4/12/1911 |
| 168. | Cesar Tovar | 4/12/1965 |
| 169. | Dick Tracewski | 4/12/1962 |
| 170. | Blake Treinen | 4/12/2014 |
| 171. | Sandy Valdespino | 4/12/1965 |
| 172. | Bill Virdon | 4/12/1955 |
| 173. | Don Wallace | 4/12/1967 |
| 174. | Ken Walters | 4/12/1960 |
| 175. | Lloyd Waner | 4/12/1927 |
| 176. | Duane Ward | 4/12/1986 |
| 177. | Jackie Warner | 4/12/1966 |
| 178. | Eddie Watt | 4/12/1966 |
| 179. | Bob Way | 4/12/1927 |
| 180. | Zack Weiss | 4/12/2018 |
| 181. | Chris Welsh | 4/12/1981 |
| 182. | Joe Wilhoit | 4/12/1916 |
| 183. | Alva Williams | 4/12/1911 |
| 184. | Gus Williams | 4/12/1911 |
| 185. | Josh Winder | 4/12/2022 |
| 186. | Whitey Witt | 4/12/1916 |
| 187. | Kerry Wood | 4/12/1998 |
| 188. | Earl Yingling | 4/12/1911 |
| 189. | Ned Yost | 4/12/1980 |
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