| Player | Birth date | First year in majors | Last year in majors | Played in majors | With StL-N | With minors | Drafted |
| Raul Amiama | 1948 | 0 | 0 | No | No | Yes | 0 |
| Guido Amidei | 0 | 0 | No | No | Yes | 0 | |
| Derrill Ammerman | 0 | 0 | No | No | Yes | 0 | |
| Charles Ammons | 0 | 0 | No | No | Yes | 0 | |
| Elmer Ammons | February 10, 1934 | 0 | 0 | No | No | Yes | 0 |
| Walter Ammon | March 12, 1913 | 0 | 0 | No | No | Yes | 0 |
| Len Amodio | 0 | 0 | No | No | Yes | 0 | |
| Robert Amos | 0 | 0 | No | No | Yes | 0 | |
| Nick Ananias | January 4, 1928 | 0 | 0 | No | No | Yes | 0 |
| Tom Ananicz | May 29, 1918 | 0 | 0 | No | No | Yes | 0 |
| John Andeits | August 25, 1936 | 0 | 0 | No | No | Yes | 0 |
| Arnold Andersen | March 27, 1906 | 0 | 0 | No | No | Yes | 0 |
| Phillip Andersen | October 28, 1983 | 0 | 0 | No | No | Yes | 2004 |
| Alex Anderson | 0 | 0 | No | No | Yes | 0 | |
| Andy Anderson | November 13, 1922 | 1948 | 1949 | Yes | Yes | No | 0 |
| Andy Anderson | April 5, 1896 | 0 | 0 | No | No | Yes | 0 |
| Andy Anderson | 0 | 0 | No | No | Yes | 0 | |
| Aubrey Anderson | 1951 | 0 | 0 | No | No | Yes | 0 |
| Bryan Anderson | December 16, 1986 | 2010 | 2015 | Yes | Yes | Yes | 2005 |
| Charles Anderson | January 29, 1920 | 0 | 0 | No | No | Yes | 0 |