Liolaemus boulengeri, also known commonly as Boulenger´s tree iguana, is a species of lizard in the family Liolaemidae. The species is endemic to Argentina.

Etymology: The specific name, boulengeri, is in honor of Belgian-born British herpetologist George Albert Boulenger.

Geographic range: L. boulengeri is found central Argentina in the provinces of Chubut, Mendoza, Neuquén, and Santa Cruz.

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

Behavior: L. boulengeri is terrestrial.

Diet: L. boulengeri preys upon insects.

Reproduction: L. boulengeri is oviparous.