The 2017−18 Bulgarian Cup was the 36th official edition of the Bulgarian annual football knockout tournament. The competition began on 19 September 2017 with the first round and finished with the final on 9 May 2018. Botev Plovdiv were the defending champions, but lost on away goals in the semi-finals to Slavia Sofia. Slavia later won the final on penalties against Levski Sofia, thus acquiring its eight Bulgarian Cup in its history. The club also qualified for the first qualifying round of the 2018–19 UEFA Europa League.