The 2008–09 Copa del Rey was the 107th staging of the Copa del Rey (including two seasons where two rival editions were played). The competition started on 23 August 2008 and concluded on 13 May 2009 with the final, held at the Mestalla Stadium in Valencia, in which Barcelona lifted the trophy for the 25th time in their history with a 4–1 victory over Athletic Bilbao, who qualified for the third qualifying round of the 2009–10 UEFA Europa League. The defending cup holders were Valencia, but they were eliminated in the quarter-finals.

Qualified teams

The following teams competed in the 2008–09 Copa del Rey: 20 teams of 2007–08 La Liga: 21 teams of 2007–08 Segunda División (Sevilla Atlético are excluded for being a reserve team of Sevilla): 24 teams of 2007–08 Segunda División B. Teams that qualified are the top five teams of each of the 4 groups (excluding reserve teams) and the four with the highest number of points out of the remaining non-reserve teams (*): 18 teams of Tercera División 2007–08. Teams that qualified are the champions of each of the 18 groups (or at least the ones with the highest number of points within their group since reserve teams are excluded):

First round

The matches were played on 23, 25, 26, 27 and 28 August 2008.

Second round

The matches were played on 3, 4 and 11 September 2008. Albacete received a bye.

Third round

The matches were played on 8 and 9 October 2008. Real Murcia received a bye.

Final phase bracket

Team listed first play home in the first leg.

Round of 32

The first leg matches were played on 28, 29 and 30 October while the second legs were played on 11, 12 and 13 November 2008.

Round of 16

The first leg matches were played on 6, 7 and 8 January while the second legs were played on 14 and 15 January 2009.

Quarter-finals

First legs

Second legs

Mallorca won 1–0 on aggregate. Athletic Bilbao won 2–1 on aggregate. ''Sevilla 4–4 Valencia on aggregate. Sevilla won on away goals.'' Barcelona won 3–2 on aggregate.

Semi-finals

First legs

Second legs

Athletic Bilbao won 4–2 on aggregate. Barcelona won 3–1 on aggregate.

Final

Top goalscorers

Source: