| Organization of the Jews in Bulgaria “Shalom” |
1 |
| organized crime |
14 |
| Oriental Institute of the University of Chicago |
2 |
| origin of the Ancient Bulgars |
4 |
| Orizovo |
1 |
| Orlin Tsanev |
1 |
| Orlova Chuka cave |
2 |
| Orlovets |
2 |
| Orlovi Skali (Eagles' Rocks) Shrine |
6 |
| ormition of the Mother of God Cathedral in Varna |
2 |
| Orpheus |
10 |
| Orpheus' lyre |
1 |
| Orphic Mysteries |
1 |
| Orphism |
2 |
| Orsoya |
2 |
| Orsoya - Baley Culture |
3 |
| Orthodox Church of Greece |
1 |
| Oryahovo |
1 |
| Oryahovo Museum of History |
1 |
| Osam River |
2 |
| Osman Pazvantoglu |
1 |
| Ossendrecht |
1 |
| osteoarchaeologist |
4 |
| Ostrets |
1 |
| Ostrets Fortress |
1 |
| ostrich egg vessel |
1 |
| ostrich eggs |
1 |
| Ostritsa |
1 |
| Ostrogoths |
2 |
| Ostrov |
1 |
| Ostrusha Tomb |
7 |
| Otacilla Severa |
1 |
| Otto von Bismarck |
16 |
| Ottoman archives |
2 |
| Ottoman army |
3 |
| Ottoman coins |
9 |
| Ottoman conquest |
2 |
| Ottoman Empire |
212 |
| Ottoman fortress |
1 |
| Ottoman gunpowder magazine Vidin |
1 |
| Ottoman Interregnum |
2 |
| Ottoman Navy |
4 |
| Ottoman sultans |
5 |
| Ottoman Turkey |
64 |
| Ottoman Turks |
97 |
| Ottoman yoke |
106 |
| Ottoman-Habsburg Wars |
1 |
| outer city |
2 |
| outer fortress wall |
9 |
| Ovcharovo |
1 |
| Ovchartsi |
1 |
| overhead power line |
1 |
| Overloon |
1 |
| Ovid |
1 |
| ox |
2 |
| oxen |
1 |
| Oxford University |
5 |
| Pacific Ocean |
3 |
| Padina |
1 |
| padlock |
2 |
| Padua |
1 |
| pafta (female belt buckle) |
2 |
| pagan |
10 |
| pagan temple |
2 |
| painted ceramics |
3 |
| painter |
1 |
| Paisiy Hilendarski |
7 |
| Paiute Indian Tribe |
1 |
| Palaeologus Dynasty |
1 |
| Palaiologos Renaissance |
2 |
| palaios |
1 |
| Palanga |
1 |
| Palatine Hill |
2 |
| paleo-ornithologist |
1 |
| Paleolithic |
21 |
| Paleolithic Age |
12 |
| paleontologist |
2 |
| paleontology |
12 |
| Pales |
1 |
| Palestine |
6 |
| palisade |
2 |
| palm oil |
1 |
| Palmate |
1 |
| Palmate Fortress |
4 |
| Palmatis Fortress |
2 |
| Palmyra |
1 |
| pamphlet |
1 |
| Pamuk Mogila |
7 |
| Pan Am Flight 103 bombing |
1 |
| Panacea |
2 |
| Panagia |
5 |
| Panagyurishte |
7 |
| Panagyurishte Gold Treasure |
17 |
| Panagyurishte Municipality |
4 |
| Panagyurishte Museum of History |
4 |
| Panayot Reyzi |
5 |
| panegyric |
1 |
| Pangaea |
2 |
| pankratiast |
1 |
| pankration |
1 |
