The 2017–18 Copa del Rey was the 116th staging of the Copa del Rey (including two seasons where two rival editions were played). The winners were assured a place for the 2018–19 UEFA Europa League group stage.
Barcelona were the three-time defending champions, and successfully defended their title following a 5–0 win over Sevilla in the final. Times up to 28 October 2017 and from 25 March 2018 are CEST (UTC+2). Times from 29 October 2017 to 24 March 2018 are CET (UTC+1).
The following teams qualified for the competition. Reserve teams were excluded.
The draw for the first and the second round was held on 28 July 2017 at 13:00 CEST in La Ciudad del Fútbol, RFEF headquarters, in Las Rozas, Madrid.[1] In this round, 32 teams from the 2016–17 Segunda División B and ten from the 2016–17 Tercera División teams gained entry. In the draw, firstly six teams from Segunda División B received a bye and then, the remaining teams this league and teams from Tercera División faced according to proximity criteria by next groups:
Formentera received a bye for the third round.
Lleida Esportiu received a bye for the round of 32.
The draw for the Round of 32 was held on 28 September 2017, in La Ciudad del Fútbol, Las Rozas de Madrid. In this round, all La Liga teams entered the competition.
Round of 32 pairings were as follows: the seven remaining teams participating in the 2016–17 Segunda División B and Tercera División faced the 2017–18 La Liga teams which qualified for European competitions. The five remaining teams participating in Segunda División faced five La Liga teams which did not qualify for European competitions. The remaining eight La Liga teams faced each other. In matches involving teams from different league tiers, the team in the lower tier played the first leg at home. This rule will also be applied in the Round of 16, but not for the Quarter-finals and Semi-finals, in which the order of legs will be based on the luck of the draw.
