Juan Cruz Mallía (born 11 September 1996) is an Argentine professional rugby union player who plays as a fullback for Top 14 club Toulouse and the Argentina national team.

Mallía can be described as a utility back, like James O'Connor or Adam Ashley-Cooper, being able to play from 10 to 15 and starting more than ten professional games in each position.

[2] Mallía played for the Jaguares in Super Rugby.

[3] In 2021, he won the European Rugby Champions Cup playing for Toulouse, scoring their only try in the final.

[4] A few weeks later, he won his first Top 14 title in a 18–8 win against La Rochelle in final.