| Achinstein, Peter |
| Acker, Kathy |
| Acton, Eliza |
| Adair, Gilbert |
| Adam, Paul for the National Parks and Wildlife Services of New South Wales |
| Adams, Brian |
| Adams, Douglas |
| Adams, Douglas & Lloyd, John |
| Adams, John |
| Adams, Murray (ed) |
| Adams, Peter |
| Adams, Richard |
| Adams, William Howard (editor) |
| Adamson, Bartlett |
| Adkins, Lesley |
| Admiral Lord Mountevans |
| Adolf Harnack |
| Adolf Schlatter |
| Adrià, Ferran; Soler, Juli; Adrià, Albert |
| Aelred Graham |
| Agar, Madeleine |
| Aggacitta Bhikkhu |
| Agus, Milena |
| Aikman, David |