Diasparactus is an extinct genus of diadectid reptiliomorphs, a group quite closely related to the amniotes, and paralleling some of their features.

Like all advanced diadectids, Diasparactus was a herbivore, though not as large as its more well known relative Diadectes.

In Diasparactus, the spines of the dorsal vertebrae are higher than in other genera in the family.

The nares and orbits were in similar positions and there were fourteen teeth with possibly a rudimentary fifteenth, a dentition typical of the family.

The feet and limbs supported the view that this animal was a marsh-dweller and probably a slow-moving herbivore.