Liolaemus antonietae, also known commonly as Antonieta's lizard and el lagarto de Antonieta in Spanish, is a species of lizard in the family Liolaemidae. The species is endemic to Chile.
The specific name, antonietae, is in honor of Chilean herpetologist Antonieta Labra Lillo.
L. antonietae is found in central Chile, in Biobío Region.
Medium-sized for its genus, L. antonietae may attain a snout-to-vent length (SVL) of about .
Mainly arboreal, L. anchietae has been observed basking on tree trunks at heights of as much as .
The mode of reproduction of L. antonietae is not known.