| [A1900] | Ariston of Paionia (fl. 331 BCE - 331 BCE) | person | represented actor |
| [A1898] | Aristonicus of Methymnae (fl. 332 BCE - 332 BCE) | person | represented actor |
| [A1258] | Aristotle (384 BCE - 322 BCE) | person | author, contributor, represented actor |
| [A1253] | Arius (ca 256 - 336) | person | represented actor |
| [A2340] | Laurentius Armbuster (fl. 1510 - 1514) | person | author of afterword, colophon |
| [A1720] | Bartholomäus Arnoldi (1465 - 9 September 1532) | person | author |
| [A1669] | Balthazar Arnoullet (1517 - 1556) | person | printer |
| [A1255] | Arnulf, Holy Roman Emperor (850 - 8 December 899) | person | represented actor |
| [A2141] | Árpád dynasty | corporate actor | represented actor |
| [A2754] | Arrecina Tertulla (died 62 or 63) | person | represented actor |
| [A2759] | Arria Fadilla (fl. 80-90) | person | represented actor |
| [A1256] | Arsames (died 1 January 520 BCE) | person | represented actor |
| [A1915] | Artabazos II (fl. 389 BCE - 328 BCE) | person | represented actor |
| [A1257] | Artaxerxes I (died 425 BCE/424 BCE) | person | represented actor |
| [A1675] | Artaxerxes II (445 BCE - 359 BCE/358 BCE) | person | represented actor |
| [A1814] | Artemisia I of Caria (fl. ca 480 BCE) | person | represented actor |
| [A3442] | Rafał Kazimierz Arteński (died 1699) | person | |
| [A234] | Thomas Ashby (14 October 1874 - 15 May 1931) | person | author |
| [A386] | Hans Asper (1499 - 21 March 1571) | person | designer, draughtsman |
| [A1043] | Francis of Assisi (1181/1182 - 3 October 1226) | person | represented actor |
