The King Alfonso XIII's Cup 1926 was the 26th staging of the Copa del Rey, the Spanish football cup competition.
The competition began on 28 February 1926, and concluded on 16 May 1926 with the final, held at the Mestalla in Valencia, in which Barcelona lifted the trophy for the seventh time following a 3–2 victory over Athletic Madrid.
For the first time ever, runners-up of each regional championship were able to participate in the tournament.
So the tournament was expanded to 24 teams.
First leg: May 9, 1926