"Haptodus" garnettensis is an extinct species of basal sphenacodont from the Late Carboniferous (Pennsylvanian) of Kansas, USA.

The holotype of "Haptodus" garnettensis is RM 14156, a partially articulated skeleton (cranial and postcranial) of immature individual.

More than 16 well-preserved specimen of various ontological states were referred to this species.

All specimens came from the Garnett Quarry, located in the Anderson County of Kansas.

They were collected from the Rock Lake Member of the Stanton Formation (Lansing Group), dating to the late Kasimovian stage of the late Pennsylvanian series, about 304 million years old.