Antonio Alsúa Alonso (25 October 1919 – 3 April 1998) was a Spanish professional footballer, who played as a midfielder. He became one of the most important players for Real Madrid CF in the 1940s, playing over 170 matches for the Spanish side and winning the Copa del Rey in 1946 and 1947. He was the elder brother of Rafael Alsúa, who also played for Real Madrid but had longer spells with Real Sociedad and Racing Santander.