Atractus trilineatus, commonly known as the three-lined ground snake, is a species of small burrowing snake in the family Colubridae.

[3] A. trilineatus is found in northern South America,[4] including the Caribbean island of Trinidad.

[3] The preferred natural habitat of A. trilineatus is forest and savanna, at altitudes from sea level to 500 m (1,600 ft), but it has also been found in agricultural and horticultural areas.

The smooth dorsal scales are in 15 rows, and the anal plate is entire.

[5] A. trilineatus is believed to prey upon soft-bodied insects and earthworms,[6] as well as fish and tadpoles.