Mann's worm snake (Letheobia manni) is a species of blind snake in the family Typhlopidae. The species is native to West Africa.
The specific name, manni, is in honor of William Montana Mann, who was an American entomologist and zoo director.
Letheobia manni has a broad, trilobate snout. It has 26 rows of scales around the body at midbody. The total length (tail included) is 40 times the diameter of the body at midbody.
Letheobia manni is found in Guinea and Liberia, at altitudes from sea level to .
Letheobia manni is oviparous.