1918 Copa del Rey
|Goals scored||25 (3.13 per match)|
The competition started on April 8, 1918, and concluded on May 2, 1918, with the Final, held at the O'Donnell in Madrid, in which Real Union lifted the trophy for the second time ever with a 2–0 victory over Madrid FC.
- North Region: Real Unión
- Center Region: Madrid FC
- South Region: Recreativo de Huelva
- Galicia: RC Fortuna
- Asturias: Sporting de Gijón
- Catalonia: RCD Español
This was a one-legged match, played in neutral ground. Real Unión advanced to semifinals.
RCD Español and Madrid CF won one match each. At that year, the goal difference was not taken into account. A replay match was played.
Madrid FC advanced to the semifinals
This was a one-legged match, played in neutral ground. Real Unión advanced to the final.
Madrid FC won 2–0 on aggregate matches.
May 12, 1918
|Real Unión||2–0||Madrid FC|
|Legarreta 45', 85'|
|Copa del Rey 1918 winners|