Euspondylus guentheri, also known commonly as Günther's sun tegu, is a species of lizard in the family Gymnophthalmidae.

[1][4] The specific epithet guentheri is in honour of Albert Günther, a German-born British zoologist.

[2][3][5] E. guentheri is mostly diurnal, spending time in low branches or basking on the ground.

[6] It is pale brown in colour (although juveniles are usually yellower), with irregular black crossbars and blotches.

[3][6] It resembles E. maculatus, the spotted sun tegu, but can be differentiated from that species by colour: E. maculatus has smaller and less pervasive blotches and is generally browner and more uniform in colour.