Darwin's ringed worm lizard (Amphisbaena darwinii) is a species of amphisbaenian in the family Amphisbaenidae. The species is endemic to South America.
The specific name, darwinii, is in honor of English naturalist Charles Darwin.
A. darwinii may attain a snout-to-vent length (SVL) of 36 cm (14 in).
A. darwinii is fossorial.
A. darwinii is oviparous.