Nicolás Vergallo (born 20 August 1983 in Rosario) is an Argentine rugby union footballer, currently playing in France for Lyon.

In October 2012, Toulouse announced that it had released Vergallo from his contract, which was supposed to end in 2014.

This freed him up to sign with the Port Elizabeth-based Super Rugby franchise, the Southern Kings.

[3] Vergallo was the second-choice scrum-half for the Southern Kings during the 2013 Super Rugby season behind Shaun Venter.

[citation needed] At the end of the Super Rugby season, he initially seemed to be set to stay with the Kings, appearing in the Eastern Province Kings squad for the 2013 Currie Cup First Division season[8] and making five starts.