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).
New entries: Clubs participating in Segunda División gained entry. Byes: One Segunda División B team received a bye. Opponents seeding: Segunda División teams faced each other. Local team seeding: Draw of lots. Knock-out tournament type: Single match
Byes: One team from Segunda División B or Tercera División which previously did not receive a bye, received one. Opponents seeding: Segunda División teams faced each other. Local team seeding: Draw of lots. Knock-out tournament type: Single match
New entries: Clubs participating in La Liga gained entry. Opponents seeding: The seven teams from La Liga which qualified for 2017–18 UEFA competitions, faced the remaining seven teams from Segunda División B and Tercera División. The five Segunda División teams played against La Liga teams. The eight remaining La Liga teams faced each other. Local team seeding: First leg at home of team in lower division. Knock-out tournament type:Double match
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:
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.