Players who made their Major League debut during the selected season. Player must have appeared in a game as a hitter or a pitcher.
Batting and Pitching statistics for debuts are available since 1957.
| Jimmy Archer | 1904-09-06 | boxscore | 21.121 | C | 5-10 | 168 | R | R | 1883-05-13 | Dublin,IR | MLB | 1904-1918 | 1904-1918 | | premium | premium | premium |
| Art Bader | 1904-08-02 | boxscore | 17.319 | OF | 5-9 | 160 | R | R | 1886-09-21 | St. Louis,MO | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Tom Barry | 1904-04-15 | boxscore | 25.011 | P | 5-9 | 155 | R | R | 1879-04-10 | St. Louis,MO | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| John Barthold | 1904-05-17 | boxscore | 22.038 | P | 5-11 | 180 | B | R | 1882-04-14 | Philadelphia,PA | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Emil Batch | 1904-09-13 | boxscore | 24.241 | 3B-OF | 5-7 | 170 | R | R | 1880-01-21 | Brooklyn,NY | MLB | 1904-1907 | 1904-1907 | | premium | premium | premium |
| Claude Berry | 1904-04-22 | boxscore | 24.073 | C | 5-7 | 165 | R | R | 1880-02-14 | Losantville,IN | MLB | 1904-1907 | 1904-1907 | | premium | premium | premium |
| John Brackenridge | 1904-04-15 | boxscore | 23.117 | P | 6-0 | 0 | R | R | 1880-12-24 | Harrisburg,PA | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Lou Bruce | 1904-06-22 | boxscore | 27.163 | P | 5-5 | 145 | L | R | 1877-01-16 | St. Regis,NY | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Bill Byers | 1904-04-15 | boxscore | 26.200 | C | 5-7 | 210 | L | R | 1877-10-03 | Bridgeton,IN | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Ralph Caldwell | 1904-09-10 | boxscore | 20.240 | P | 5-9 | 155 | L | L | 1884-01-18 | Philadelphia,PA | MLB | 1904-1905 | 1904-1905 | | premium | premium | premium |
| Howie Camnitz | 1904-04-22 | boxscore | 22.248 | P | 5-9 | 169 | R | R | 1881-08-22 | Covington,KY | MLB | 1904-1913 | 1904-1913 | | premium | premium | premium |
| Wirt Cannell | 1904-04-14 | boxscore | 24.087 | OF | 5-11 | 180 | L | R | 1880-01-23 | South Bridgton,ME | MLB | 1904-1905 | 1904-1905 | | premium | premium | premium |
| Bill Carney | 1904-08-22 | boxscore | 30.157 | OF | 5-10 | 0 | B | R | 1874-03-25 | St. Paul,MN | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Harry Cassady | 1904-08-08 | boxscore | 24.024 | OF | 5-8 | 145 | L | L | 1880-07-20 | Bellflower,IL | MLB | 1904-1905 | 1904-1905 | | premium | premium | premium |
| Joe Cassidy | 1904-04-18 | boxscore | 21.074 | SS | 5-9 | 145 | R | R | 1883-02-08 | Chester,PA | MLB | 1904-1905 | 1904-1905 | | premium | premium | premium |
| Walter Clarkson | 1904-07-02 | boxscore | 25.247 | P | 5-10 | 150 | R | R | 1878-11-03 | Cambridge,MA | MLB | 1904-1908 | 1904-1908 | | premium | premium | premium |
| Orth Collins | 1904-06-01 | boxscore | 24.040 | OF | 6-0 | 150 | L | R | 1880-04-27 | Lafayette,IN | MLB | 1904-1909 | 1904-1909 | | premium | premium | premium |
| Frank Corridon | 1904-04-15 | boxscore | 23.146 | P | 6-0 | 170 | R | R | 1880-11-25 | Newport,RI | MLB | 1904-1910 | 1904-1910 | | premium | premium | premium |
| Art Devlin | 1904-04-14 | boxscore | 24.186 | 3B | 6-0 | 175 | R | R | 1879-10-16 | Washington,DC | MLB | 1904-1913 | 1904-1913 | | premium | premium | premium |
| She Donahue | 1904-04-29 | boxscore | 26.310 | SS-3B | 5-9 | 0 | R | R | 1877-06-29 | Oswego,NY | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Mike Donovan | 1904-05-29 | boxscore | 22.228 | 3B | 5-8 | 155 | R | R | 1881-10-18 | Brooklyn,NY | MLB | 1904-1908 | 1904-1908 | | premium | premium | premium |
| Tom Doran | 1904-04-19 | boxscore | 23.143 | C | 5-11 | 152 | L | R | 1880-12-02 | Westchester County,NY | MLB | 1904-1906 | 1904-1906 | | premium | premium | premium |
| Tom Dougherty | 1904-04-24 | boxscore | 22.334 | P | 5-11 | 195 | L | R | 1881-05-30 | Chicago,IL | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Gus Dundon | 1904-04-14 | boxscore | 29.285 | 2B | 5-10 | 165 | R | R | 1874-07-10 | Columbus,OH | MLB | 1904-1906 | 1904-1906 | | premium | premium | premium |
| Bull Durham | 1904-09-15 | boxscore | 27.086 | P | 5-10 | 0 | R | R | 1877-06-27 | New Oxford,PA | MLB | 1904-1909 | 1904-1909 | | premium | premium | premium |
| Claud Elliott | 1904-04-16 | boxscore | 27.156 | P | 6-0 | 190 | R | R | 1876-11-17 | Pardeeville,WI | MLB | 1904-1905 | 1904-1905 | | premium | premium | premium |
| Cy Ferry | 1904-05-12 | boxscore | 25.233 | P | 6-1 | 170 | R | R | 1878-09-27 | Hudson,NY | MLB | 1904-1905 | 1904-1905 | | premium | premium | premium |
| Tom Fisher | 1904-04-17 | boxscore | 23.172 | P | 5-11 | 185 | R | R | 1880-11-01 | Anderson,IN | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Ernie Groth | 1904-09-06 | boxscore | 19.260 | P | 5-11 | 175 | R | R | 1884-12-24 | Cedarsburg,WI | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Bob Hall | 1904-04-18 | boxscore | 25.125 | OF-3B | 5-10 | 158 | R | R | 1878-12-20 | Baltimore,MD | MLB | 1904-1905 | 1904-1905 | | premium | premium | premium |
| Jack Hickey | 1904-04-16 | boxscore | 22.169 | P | 5-10 | 170 | R | L | 1881-11-03 | Minneapolis,MN | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Izzy Hoffman | 1904-04-14 | boxscore | 29.106 | OF | 5-9 | 160 | L | L | 1875-01-05 | Bridgeport,NJ | MLB | 1904-1907 | 1904-1907 | | premium | premium | premium |
| Beany Jacobson | 1904-04-30 | boxscore | 22.334 | P | 6-0 | 170 | L | L | 1881-06-05 | Port Washington,WI | MLB | 1904-1907 | 1904-1907 | | premium | premium | premium |
| Charlie Jaeger | 1904-09-09 | boxscore | 29.152 | P | 6-1 | 195 | R | R | 1875-04-17 | Ottawa,IL | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Joe Koukalik | 1904-09-01 | boxscore | 24.187 | P | 5-8 | 160 | R | R | 1880-03-03 | Chicago,IL | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Bill Lauterborn | 1904-09-20 | boxscore | 25.109 | 2B-3B | 5-6 | 140 | R | R | 1879-06-09 | Hornell,NY | MLB | 1904-1905 | 1904-1905 | | premium | premium | premium |
| Charlie Loudenslager | 1904-04-15 | boxscore | 22.334 | 2B | 5-9 | 186 | | R | 1881-05-21 | Baltimore,MD | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Harry Lumley | 1904-04-14 | boxscore | 23.202 | OF | 5-10 | 183 | L | L | 1880-09-29 | Forest City,PA | MLB | 1904-1910 | 1904-1910 | | premium | premium | premium |
| Johnny Lush | 1904-04-22 | boxscore | 18.200 | P | 5-10 | 165 | L | L | 1885-10-08 | Williamsport,PA | MLB | 1904-1910 | 1904-1910 | | premium | premium | premium |
| Mike Lynch | 1904-06-21 | boxscore | 23.363 | P | 6-2 | 170 | R | R | 1880-06-28 | Holyoke,MA | MLB | 1904-1907 | 1904-1907 | | premium | premium | premium |
| Sherry Magee | 1904-06-29 | boxscore | 19.331 | OF | 5-11 | 179 | R | R | 1884-08-06 | Clarendon,PA | MLB | 1904-1919 | 1904-1919 | | premium | premium | premium |
| Doc Marshall | 1904-04-15 | boxscore | 28.212 | C-OF | 6-0 | 185 | R | R | 1875-09-22 | Butler,PA | MLB | 1904-1909 | 1904-1909 | | premium | premium | premium |
| Del Mason | 1904-04-23 | boxscore | 20.181 | P | 6-0 | 160 | R | R | 1883-10-29 | Newfane,NY | MLB | 1904-1907 | 1904-1907 | | premium | premium | premium |
| Gene McAuliffe | 1904-08-17 | boxscore | 32.178 | C | 6-1 | 180 | R | R | 1872-02-28 | Randolph,MA | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Harry McChesney | 1904-09-17 | boxscore | 24.113 | OF | 5-9 | 165 | R | R | 1880-06-01 | Pittsburgh,PA | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Jim McGinley | 1904-09-22 | boxscore | 25.361 | P | 5-10 | 165 | R | R | 1878-10-02 | Groveland,MA | MLB | 1904-1905 | 1904-1905 | | premium | premium | premium |
| Ed McNichol | 1904-07-09 | boxscore | 25.186 | P | 5-5 | 170 | R | R | 1879-01-10 | Martins Ferry,OH | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| James Mullen | 1904-06-01 | boxscore | 27.149 | 2B-1B | 5-10 | 173 | R | R | 1877-01-09 | Avoca,PA | MLB | 1904-1905 | 1904-1905 | | premium | premium | premium |
| Simmy Murch | 1904-09-20 | boxscore | 23.308 | 1B | 6-3 | 220 | R | R | 1880-11-21 | Castine,ME | MLB | 1904-1908 | 1904-1908 | | premium | premium | premium |
| George Nill | 1904-09-27 | boxscore | 23.080 | 2B-3B | 5-7 | 160 | R | R | 1881-07-14 | Fort Wayne,IN | MLB | 1904-1908 | 1904-1908 | | premium | premium | premium |
| Pete Noonan | 1904-06-20 | boxscore | 22.213 | C-1B | 6-0 | 180 | R | R | 1881-11-24 | West Stockbridge,MA | MLB | 1904-1907 | 1904-1907 | | premium | premium | premium |
| Kid O'Hara | 1904-09-15 | boxscore | 28.277 | OF | 5-8 | 152 | B | R | 1875-12-19 | Wilkes-Barre,PA | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Charley O'Leary | 1904-04-14 | boxscore | 28.188 | SS | 5-7 | 165 | R | R | 1875-10-15 | Chicago,IL | MLB | 1904-1934 | 1904-1934 | | premium | premium | premium |
| Bill O'Neill | 1904-05-07 | boxscore | 24.111 | OF | 5-11 | 175 | B | R | 1880-01-22 | Saint John,NB | MLB | 1904-1906 | 1904-1906 | | premium | premium | premium |
| Peaches O'Neill | 1904-04-16 | boxscore | 24.235 | C | 5-11 | 165 | R | R | 1879-08-30 | Anderson,IN | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Fred Odwell | 1904-04-16 | boxscore | 31.210 | OF | 5-10 | 160 | L | R | 1872-09-25 | Downsville,NY | MLB | 1904-1907 | 1904-1907 | | premium | premium | premium |
| Harry Ostdiek | 1904-09-10 | boxscore | 23.156 | C | 5-11 | 185 | R | R | 1881-04-12 | Ottumwa,IA | MLB | 1904-1908 | 1904-1908 | | premium | premium | premium |
| Jesse Purnell | 1904-10-01 | boxscore | 23.148 | 3B | 5-6 | 140 | L | R | 1881-05-11 | Glenside,PA | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Jack Rafter | 1904-09-24 | boxscore | 29.223 | C | 5-8 | 165 | R | R | 1875-02-20 | Troy,NY | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Bugs Raymond | 1904-09-23 | boxscore | 22.216 | P | 5-10 | 180 | R | R | 1882-02-24 | Chicago,IL | MLB | 1904-1911 | 1904-1911 | | premium | premium | premium |
| Doc Reisling | 1904-09-10 | boxscore | 30.054 | P | 5-10 | 180 | R | R | 1874-07-25 | Martins Ferry,OH | MLB | 1904-1910 | 1904-1910 | | premium | premium | premium |
| Butch Rementer | 1904-10-08 | boxscore | 26.214 | C | 5-6 | 180 | R | R | 1878-03-14 | Philadelphia,PA | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Chick Robitaille | 1904-09-02 | boxscore | 25.190 | P | 5-8 | 150 | R | R | 1879-03-02 | Whitehall,NY | MLB | 1904-1905 | 1904-1905 | | premium | premium | premium |
| Claude Rossman | 1904-09-16 | boxscore | 23.096 | 1B | 6-0 | 188 | L | L | 1881-06-17 | Philmont,NY | MLB | 1904-1909 | 1904-1909 | | premium | premium | premium |
| Admiral Schlei | 1904-04-24 | boxscore | 26.108 | C | 5-9 | 179 | R | R | 1878-01-12 | Cincinnati,OH | MLB | 1904-1911 | 1904-1911 | | premium | premium | premium |
| Frank Schulte | 1904-09-21 | boxscore | 22.009 | OF | 5-11 | 170 | L | R | 1882-09-17 | Cohocton,NY | MLB | 1904-1918 | 1904-1918 | | premium | premium | premium |
| Bill Schwartz | 1904-05-02 | boxscore | 20.014 | 1B | 6-2 | 185 | R | R | 1884-04-22 | Cleveland,OH | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Spike Shannon | 1904-04-15 | boxscore | 26.073 | OF | 5-11 | 180 | B | R | 1878-02-07 | Pittsburgh,PA | MLB | 1904-1908 | 1904-1908 | | premium | premium | premium |
| Bull Smith | 1904-08-30 | boxscore | 24.015 | OF | 6-0 | 180 | R | R | 1880-08-20 | Plum,WV | MLB | 1904-1906 | 1904-1906 | | premium | premium | premium |
| Frank Smith | 1904-04-22 | boxscore | 24.182 | P | 5-11 | 194 | R | R | 1879-10-28 | Pittsburgh,PA | MLB | 1904-1912 | 1904-1912 | | premium | premium | premium |
| Tom Stankard | 1904-07-02 | boxscore | 22.109 | SS-3B | 6-0 | 190 | R | R | 1882-03-20 | Waltham,MA | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Tom Stanton | 1904-04-19 | boxscore | 29.183 | C | 5-10 | 175 | B | R | 1874-10-25 | St. Louis,MO | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Joe Stewart | 1904-09-13 | boxscore | 25.192 | P | 5-11 | 175 | R | R | 1879-03-11 | Monroe,NC | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| George Stovall | 1904-07-04 | boxscore | 25.229 | 1B | 6-2 | 180 | R | R | 1878-11-23 | Leeds,MO | MLB | 1904-1913 | 1904-1913 | | premium | premium | premium |
| Gabby Street | 1904-09-13 | boxscore | 21.353 | C | 5-11 | 180 | R | R | 1882-09-30 | Huntsville,AL | MLB | 1904-1931 | 1904-1931 | | premium | premium | premium |
| Elmer Stricklett | 1904-04-22 | boxscore | 27.242 | P | 5-6 | 140 | R | R | 1876-08-29 | Glasco,KS | MLB | 1904-1907 | 1904-1907 | | premium | premium | premium |
| Andy Sullivan | 1904-09-13 | boxscore | 20.018 | SS | | 0 | R | R | 1884-08-30 | Southborough,MA | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Charlie Swindells | 1904-09-07 | boxscore | 25.322 | C | 6-0 | 180 | R | R | 1878-10-26 | Rockford,IL | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Bob Unglaub | 1904-04-15 | boxscore | 22.263 | 1B | 5-11 | 178 | R | R | 1881-07-31 | Baltimore,MD | MLB | 1904-1910 | 1904-1910 | | premium | premium | premium |
| Harry Vahrenhorst | 1904-09-21 | boxscore | 19.224 | H | 6-1 | 175 | R | R | 1885-02-13 | St. Louis,MO | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Deacon Vanburen | 1904-04-21 | boxscore | 33.136 | OF | 5-10 | 175 | L | R | 1870-12-14 | LaSalle County,IL | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Rube Vinson | 1904-09-27 | boxscore | 25.197 | OF | 5-9 | 168 | R | R | 1879-03-20 | Dover,DE | MLB | 1904-1906 | 1904-1906 | | premium | premium | premium |
| Ed Walsh | 1904-05-07 | boxscore | 22.363 | P | 6-1 | 193 | R | R | 1881-05-14 | Plains,PA | MLB | 1904-1917 | 1904-1917 | | premium | premium | premium |
| Jack White | 1904-06-26 | boxscore | 26.164 | OF | 5-6 | 0 | R | R | 1878-01-19 | Traders Point,IN | MLB | 1904-1904 | 1904-1904 | | premium | premium | premium |
| Sam Woodruff | 1904-04-14 | boxscore | 27.114 | 3B-2B | 5-9 | 160 | R | R | 1876-12-27 | Chilo,OH | MLB | 1904-1910 | 1904-1910 | | premium | premium | premium |
| 85 record(s) |