| name | date created | date dissolved | Length (m) | country |
|---|---|---|---|---|
| Frontière entre la Bulgarie et la Grèce | 1908 | 493,000 | Bulgaria, Greece | |
| Frontière entre la Bulgarie et la Macédoine | from 1991 | 148,000 | Bulgaria, Macedonia | |
| Bulgaria–Turkey border | 1908 | 259,000 | Bulgaria, Turkey | |
| Bulgaria–Romania border | 1878 | 608,000 | Bulgaria, Romania | |
| Frontière entre la Bulgarie et la Serbie | 318,000 | Bulgaria, Serbia |