Heterostylum is a genus of flies belonging to the family Bombyliidae (bee-flies).

There are 14 described species, distributed throughout the Americas.

These are robust and very hairy flies with a body length of 10–15 mm.

They can be distinguished from similar genera by an indentation in the hind margin of the eye[2] and unique wing venation.

[3] Larvae of the genus feed on mining bees.