Mariano Martín Alonso (20 October 1919 – 9 September 1998) was a Spanish footballer who played as a striker.
In early 1944, whilst appearing in a friendly match for Catalonia, Martín suffered a severe knee ligament injury, from which he never fully recovered.
However, as he played in only 29 La Liga games in his last three seasons combined, he still managed to score on 14 occasions.
Martín closed out his career in 1952, after one year apiece with Gimnàstic de Tarragona and Real Zaragoza and as many with his second club, UE Sant Andreu.
His debut came on 12 April 1942 in Milan, during a 1–1 friendly draw with Germany.