The knob-tailed geckos or knob-tails, are a group of species of geckos, all found in the genus Nephrurus.
Lizards of this genus are easily distinguished by their short bodies, large heads, small legs, and short, carrot-shaped tails that often end in a small knob.
The former Nephrurus milii Bory de Saint-Vincent, 1823, is now Underwoodisaurus milii (Bory de Saint-Vincent, 1823) – barking gecko.
Some species are sold and captive bred as pets such as Nephrurus amyae, Nephrurus asper, Nephrurus cinctus, Nephrurus deleani, Nephrurus laevissimus, Nephrurus levis, Nephrurus vertebralis and Nephrurus wheeleri.