Liolaemus fabiani, also known commonly as Fabian's lizard, Yanez's tree iguana, and lagartija de Fabián in Spanish, is a species of lizard in the family Liolaemidae.

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

[5] The species was first described by José L. Yáñez and Herman Núñez in 1983, from a sample collected at a high elevation, 2,450 m (8,040 ft), near San Pedro de Atacama in Llano de Vilama in September 1981 by the Chilean National Museum of Natural History.

[6] The preferred natural habitat of L. fabiani is hot desert, at altitudes of 2,300–3,000 m (7,500–9,800 ft), where it is found near water, and has been observed swimming in search of prey.

[1] 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.