The Copa del Rey 1920 was the 20th staging of the Copa del Rey, the Spanish football cup competition.
The competition started in March 1920 and concluded on May 2, 1920, with the Final, held at El Molinón in Gijon, in which FC Barcelona lifted the trophy for the fourth time with a 2–0 victory over Athletic Bilbao.
Athletic de Bilbao qualified for the semifinals.
Byes: Real Unión, FC Barcelona (drawn against Sevilla FC, who withdrew after their proposal to play both legs in Madrid was rejected).
Athletic de Bilbao qualified for the final.