The King Alfonso XIII's Cup 1923 was the 23rd staging of the Copa del Rey, the Spanish football cup competition. The competition started on 25 March 1923, and concluded on 13 May 1923, with the final, held at the Les Corts in Barcelona, in which Athletic Bilbao lifted the trophy for the ninth time with a 1–0 victory over CD Europa with Travieso netting the only goal of the match.

Teams

Quarterfinals

First leg

Second leg

Athletic de Bilbao qualified for the semifinals 8–1 on agg. CD Europa qualified for the semifinals 6–1 on agg.

Tie break

Semifinals

First leg

Second leg

Athletic Bilbao qualified for the semifinals 2–0 on agg. CD Europa qualified for the semifinals 5–3 on agg.

Final