Liolaemus fitzgeraldi, commonly known as Fitzgerald´s tree iguana and la lagartija de Aconcagua (in Spanish), is a species of lizard in the family Liolaemidae. It is native to southwestern South America.

Etymology: The specific name, fitzgeraldi, is in honor of mountaineer Edward Arthur FitzGerald.

Geographic range: L. fitzgeraldi is found in the Andes in Argentina (Mendoza Province, San Juan Province) and Chile (Coquimbo Region, Valparaíso Region.

Habitat: The preferred natural habitats of L. fitzgeraldi are shrubland and grassland, at altitudes of .

Reproduction: L. fitzgeraldi is ovoviviparous.