The 1978–79 Copa del Rey was the 77th staging of the Spanish Cup.
The competition began on 20 September 1978 and concluded on 30 June 1979 with the final.
Bye: Valladolid Promesas Bye: Valladolid Bye: Murcia, Celta, Sevilla, Rayo Vallecano, Athletic Bilbao, Elche, Salamanca, Alavés and Burgos.