| Algerian Cup | |
| Year: | 1990–91 |
| Winners: | USM Bel-Abbès (1) |
| Second: | JS Kabylie |
| Prev Season: | 1989–90 |
| Next Season: | 1991–92 |
The 1990–91 Algerian Cup is the 28th edition of the Algerian Cup. ES Sétif are the defending champions, having beaten MSP Batna 1–0 in the previous season's final.