| Competition: | Bulgarian B Group |
| Season: | 1990–91 |
| Winners: | Hebar |
| Promoted: | Hebar Dobrudzha |
| Relegated: | Bdin Akademik Sofia Pirin Razlog |
| League Topscorer: | Stoyan Dimov (25 goals) |
| Matches: | 342 |
| Total Goals: | 873 |
| Prevseason: | 1989–90 |
| Nextseason: | 1991–92 |
The 1990–91 B Group was the 35th season of the Bulgarian B Football Group, the second tier of the Bulgarian football league system. A total of 19 teams contested the league.[1]
Hebar Pazardzhik sealed an instant return to the A Group by sealing the B Group title. Dobrudzha Dobrich returned to the elite after twenty-two seasons away as runners-up.
| Rank | Scorer | Club | Goals |
|---|---|---|---|
| 1 | Stoyan Dimov | 25 | |
| 2 | Blagovest Petkov | 19 | |
| 3 | Kiril Vasilev | 18 | |
| 4 | Veselin Mihaylov | 17 | |
| 5 | Dimitar Trendafilov | 16 | |
| 6 | Mariyan Kirchev | 15 | |
| Atanas Dimov | |||
| 8 | Strumen Avkov | 14 | |
| Ventsislav Spasov | |||
| Nikolay Bachvarov | |||
| Borislav Simeonov | |||