The 2020–21 Bulgarian Cup was the 39th official edition of the Bulgarian annual football knockout tournament. The competition began on 29 September 2020 with the preliminary round and finished with the final on 19 May 2021. Lokomotiv Plovdiv were the defending cup winners, but were eliminated after extra time by Ludogorets Razgrad in the quarter-finals. After CSKA Sofia missed out on the cup after losing last year's final, this time they won it against Arda Kardzhali for their 21st cup title and qualified for the second qualifying round of the 2021–22 UEFA Europa Conference League.

Lokomotiv Plovdiv, commonly known as Loko Plovdiv, is a Bulgarian professional association football club based in Plovdiv. Lokomotiv's home ground is the Lokomotiv Stadium which is situated in Lauta Park and has a capacity of 14,500 spectators.