Liolaemus acostai is a species of lizard in the family Liolaemidae. The species is endemic to Argentina.
The specific name, acostai, is in honor of Argentinian herpetologist Juan Carlos Acosta.
L. acostai is found in San Juan Province, Argentina.
The preferred natural habitat of L. acostai is grassland, at altitudes of .
L. acostai is terrestrial.
L. acostai preys predominately upon ants.
L. acostai is oviparous.