Sphenomorphus muelleri, also known commonly as Mueller's skink and Müllers Keilskink in German, is a species of lizard in the subfamily Sphenomorphinae of the family Scincidae. The species is native to Indonesia.
The specific name, muelleri, is in honor of German naturalist Salomon Müller.
Sphenomorphus muelleri may attain a snout-to-vent length (SVL) of and a total length (tail included) of .
The preferred natural habitat of Sphenomorphus muelleri is forest, at elevations from sea level to .
Sphenomorphus muelleri is terrestrial, fossorial, diurnal, and crepuscular.
Sphenomorphus muelleri preys upon earthworms.
Sphenomorphus muelleri is oviparous.
Sphenomorphus muelleri is the type species of the genus Sphenomorphus.