The Goldfields spiny-tailed gecko (Strophurus assimilis) is a species of lizard in the family Diplodactylidae.

It was recognized as a valid species and given the scientific name Diplodactylus assimilis in 1988 by Glen Milton Storr, the specific name assimilis meaning 'similar' in Latin (in reference to its similarity to the eastern spiny-tailed gecko).

In 2023, it was found that some specimens assigned to Goldfields spiny-tailed gecko were actually part of a separate cryptic species based on molecular evidence.

It has enlarged tan to orange tubercles arranged in a pair of parallel, mostly continuous, wavy lines down either side of the dorsal mid-line.

[4] The natural habitat of S. assimilis is mallee spinifex and acacia shrubland in arid and semiarid areas, often with red-brown sand.