Mariano Galarza (born November 12, 1986, in 25 de Mayo, Buenos Aires) is an Argentine rugby union player.

Galarza, a student of medicine, was selected to Los Pumas squad for the 2008 end of year tour to Europe.

He signed a deal with Leinster at the start of the 2010–11 season and made his Celtic League debut against Glasgow Warriors in September 2010.

After just four caps he left Leinster in February 2011 to play for Argentine side Pampas XV in the Vodacom Cup.

[3] On 4 October 2018, Galarza left Gloucester with immediate effect to join French side Bordeaux in the Top 14 for 2018–19 season.