The 1990–91 Bulgarian Cup was the 51st season of the Bulgarian Cup.
[1] Levski Sofia won the competition, beating Botev Plovdiv 2–1 in the final at the Ivaylo Stadium in Veliko Tarnovo.
[2] In this round entered winners from the preliminary rounds together with the teams from B Group.
This round featured winners from the First Round and all 16 teams from A Group.