Christian Alonso Martínez Mena (born 19 April 1994) is a professional footballer who plays as a defensive midfielder for Liga FPD club Cartaginés.

Born in Costa Rica, he represents El Salvador at international level.

Martínez began his career with his local club Municipal Liberia, making his first professional appearance in a 2–0 Liga FPD win over La U Universitarios on 2 August 2015.

[4] Martínez was born in Costa Rica, and is of Salvadoran descent through his father.

[5] A youth international for Costa Rica, he debuted for the senior Costa Rica national team in a friendly 0–0 tie with Bosnia and Herzegovina on 27 March 2021.