| architrave |
2 |
| Archon |
3 |
| Arctic Ocean |
1 |
| Arda River |
8 |
| Ardi |
1 |
| Ardino |
7 |
| Ardipithecus ramidus |
1 |
| Arelate |
1 |
| Arena di Serdica hotel |
4 |
| Argonautica expedition |
1 |
| Argonauts |
2 |
| Arheologia (Sofia) Journal |
1 |
| aristocrat |
3 |
| Arius Papus |
1 |
| Arizona |
1 |
| Arles |
1 |
| armamentarium |
3 |
| armband |
1 |
| armed robbery |
2 |
| Armenia |
5 |
| Armenian |
1 |
| Armira River |
1 |
| armor |
3 |
| Arnd Bauerkaemper |
1 |
| Arrian |
2 |
| Arrian of Nicomedia |
1 |
| arrow |
16 |
| arrow coins |
4 |
| arrow tip |
17 |
| arrow tips |
10 |
| arson |
3 |
| art studies |
1 |
| Artemis |
1 |
| artesian well |
1 |
| Arthur Wellesley |
1 |
| artificial port |
2 |
| artisan |
2 |
| Aryan |
1 |
| aryballos |
1 |
| Asarel Medet |
4 |
| Ascent (Vazdigane) Foundation |
5 |
| Asclepius |
5 |
| Asen and Petar's Uprising |
17 |
| Asen Dynasty |
16 |
| Asen Salkin |
3 |
| Asen's Fortress |
17 |
| Asen's Quarter |
10 |
| Asenevtsi Committee |
1 |
| Asenevtsi Monument |
6 |
| Asenevtsi Quarter |
6 |
| Asenova Krepost |
8 |
| Asenovgrad |
20 |
| Asenovgrad Mayor |
1 |
| Asenovgrad Municipality |
5 |
| Asenovgrad Museum of History |
8 |
| Asenovgrad Museum of Paleontology |
1 |
| Asenovgrad-Smolyan road |
1 |
| Asenovrad |
2 |
| ashes |
3 |
| Ashkenazi Jews |
2 |
| Asia |
2 |
| Asia Minor |
18 |
| askos |
1 |
| Asparuhovo Quarter |
2 |
| aspers (asprons) |
1 |
| assassination |
1 |
| Association for Restoration and Preservation of Bulgarian Traditions “Avitohol” |
3 |
| Association of Restorers in Bulgaria |
1 |
| Assos |
1 |
| Assyrians |
2 |
| Asti |
10 |
| astragals |
1 |
| astronaut |
1 |
| astronomical observatory |
2 |
| Astyages |
1 |
| Astyanax (Scamandrius) |
1 |
| Atanas Atanasov |
2 |
| Atanas Bobokov |
1 |
| Atanas Dimitrov |
3 |
| Atanas Kateliev |
1 |
| Atanas Kisyov |
1 |
| Atanas Koychev |
1 |
| Atanas Kunev |
1 |
| Atanas Palazov |
1 |
| Atanas Peykov |
4 |
| Atanasios Guridis |
1 |
| Athamas |
1 |
| Athanasios Sideris |
1 |
| Athanasius of Alexandria |
1 |
| ATHAR Project |
1 |
| Athena |
4 |
| Athens |
17 |
| athletes |
2 |
| Atiya Peninsula |
4 |
| Atlantic bonito |
2 |
| Atlantic Ocean |
1 |
| Atlantis |
1 |
| atmosphere |
1 |
| Atomium Monument |
1 |
| Atreus |
1 |
