Horacio Casarín Garcilazo (25 May 1918 – 10 April 2005) was a Mexican professional football player and coach who established himself as one of his country's most popular sports figures in the 1940s and 1950s.

A symbol for Atlante, the team Casarín served for the majority of his career, the skilled forward also played for Necaxa, León, Asturias, Club América, Real España, Monterrey and Zacatepec in his country, as well as FC Barcelona in Spain and the Mexico national team.

The game ended in a 2–2 draw, but outraged Necaxa fans expressed their ire by burning Asturia's wooden stadium.

With Atlante, Casarín scored 95 goals and helped the Potros win the 1946–47 season championship, while cementing his popularity by acting in the football-themed movie, "The sons of Don Venacio".

Casarín's failing health finally gave out on 10 April 2005, only a few months after his wife, Maria Elena King, had died.