Liolaemus fabiani, commonly known as Fabian´s lizard, Yanez´s tree iguana, and lagartija de Fabián in Spanish, is a species of lizard in the family Liolaemidae. It is native to Chile.

Etymology: The specific name, fabiani, is in honor of Chilean ecologist Fabián Jaksic.

Geographic range: L. fabiani is endemic to the Salar de Atacama, the Atacama salt flat, in northern Chile.

The species was first described by José L. Yáñez and Herman Núñez in 1983, from a sample collected at a high elevation, , near San Pedro de Atacama in Llano de Vilama in September 1981 by the Chilean National Museum of Natural History.

Habitat: The preferred natural habitat of L. fabiani is hot desert, at altitudes of , where it is found near water, and has been observed swimming in search of prey.

 Principle diagnostic features of L. fabiani are: "subtriangular head with temporal and occipital regions more prominent than in other species of the genus; dorsal humeral scales smooth and triangular; color pattern ornamented with red and black spots."

Diet: L. fabiani preys upon mosquitoes and other insects.

Reproduction: L. fabiani is viviparous.