The Copa del Rey 1928–29 (known at that time as King Alfonso XIII's Cup) was the 29th edition of the Copa del Rey. The competition started on December 8, 1928, and concluded on February 3, 1929, with the final, held at the Estadio Mestalla in Valencia.
RCD Español won the competition for the first time.
Teams
32 teams entered the competition, making a new record of participants. Navarre and the Canary Islands sent their champions for the first time. Catalonia, the Center Region, Gipuzkoa sent three teams each. The rest of communities sent their champions and runners-up.