| Radnevo Museum of History |
3 |
| Radomir Municipality |
1 |
| Radoslav Petkov |
1 |
| Radostina Encheva |
2 |
| Radostina Georgieva |
1 |
| Radyuvene |
2 |
| Raetia |
1 |
| Rafail Popov |
1 |
| raft sailing |
2 |
| Rahovets Fortress |
16 |
| railways |
3 |
| rain |
1 |
| rakia |
1 |
| Rakita |
1 |
| Rakitovo |
1 |
| Rakitovo Municipality |
2 |
| Rakla |
1 |
| Ralitsa Dobreva |
1 |
| ram |
6 |
| ram head |
1 |
| rammer |
1 |
| rampart |
7 |
| rampart wall |
6 |
| ransom |
1 |
| Ranuli |
5 |
| Rasho Rashev |
2 |
| Ratiaria |
25 |
| Ratiariensia |
1 |
| rattle |
1 |
| Ravenna |
1 |
| Ravenna Exarchate |
1 |
| Ravnishta |
1 |
| Ravno |
5 |
| rayah |
1 |
| Raycho Marinov |
2 |
| Raykova Mound |
2 |
| Rayna Bardareva |
1 |
| Razdelna |
3 |
| Razgrad |
17 |
| Razgrad Clock Tower |
2 |
| Razgrad District |
7 |
| Razgrad Mayor |
1 |
| Razgrad Mosque |
1 |
| Razgrad Municipality |
5 |
| Razgrad Regional Museum of History |
14 |
| Razlog |
6 |
| Razlog Municipality |
4 |
| Razlog Museum of History "Nikola Parapunov" |
1 |
| Reach Subsea |
3 |
| real |
1 |
| rear admiral |
1 |
| Rebellion of Petar and Asen |
1 |
| rebels |
3 |
| rebirth |
1 |
| reconstruction |
1 |
| Red Army |
2 |
| red deer |
4 |
| red marble pillar (Breccia Carolina) |
1 |
| red polish pottery |
1 |
| red pottery |
2 |
| Red Terror |
1 |
| red varnish pottery |
2 |
| red-figure pottery |
6 |
| red-gloss ceramics |
3 |
| reddish seeds |
1 |
| redoubt |
1 |
| refrigeration |
1 |
| regent |
1 |
| Reggio di Calabria |
1 |
| Regine Thomas |
1 |
| Regio Montanesium |
5 |
| Region of Macedonia |
2 |
| Region of Moesia |
2 |
| Regional Development Minister |
1 |
| Regional National Library "Ivan Vazov" in Plovdiv |
3 |
| Reichenbach Monastery |
1 |
| Reims |
1 |
| Reims Gospel |
1 |
| rein |
1 |
| rein rings |
1 |
| relics |
25 |
| relics theft |
3 |
| relief |
9 |
| religious art |
1 |
| reliquary |
23 |
| Renaissance |
3 |
| Rene Schoen |
1 |
| Reni Petrova |
2 |
| repairs |
3 |
| replica |
2 |
| replica coin |
4 |
| Republic of Macedonia |
5 |
| Republic of Venice |
3 |
| Republic's Pass |
1 |
| Republika Srpska |
1 |
| rescue excavations |
172 |
| Rescue of Bulgarian Jews |
8 |
| research |
1 |
| research paper |
1 |
| restoration |
194 |
