Liolaemus fitzgeraldi, also known commonly as Fitzgerald's tree iguana and la lagartija de Aconcagua (in Spanish), is a species of lizard in the family Liolaemidae.

[2] The species is native to southwestern South America.

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

[3] L. fitzgeraldi is found in the Andes in Argentina (Mendoza Province, San Juan Province) and Chile (Coquimbo Region, Valparaíso Region.

[1][2] The preferred natural habitats of L. fitzgeraldi are shrubland and grassland, at altitudes of 2,700–4,500 m (8,900–14,800 ft).