Ariel Roberto Pereyra Legallais (born 11 November 1973) is a retired Argentine–born Chilean footballer that has played at Godoy Cruz, Venezuela and several clubs in Chile.
Pereyra began his career at Godoy Cruz Antonio Tomba, professional club of his natal city Mendoza.
Following a brief spell in Coquimbo Unido in 2001, the incoming year he moved to Everton (Wanderers' archi–rival), where he helped the team to won the 2003 Primera B championship (Chile second-level tournament).
In June 2005, after the entire 2004 in Venezuelan football playing for Italmaracaibo, Pereyra returned to Chile, signing for Unión La Calera, where he coincided with players such as Víctor Rivero and Christian Riffo.
In 2021, he was the manager of San Antonio Unido in the Segunda División Profesional de Chile.