MacConnell's oryzomys is a rodent recorded in the Amazonian region of eastern Ecuador. Ecuadorian accounts describe it as nocturnal and solitary on the ground.
It is about the size of a medium rat, with brown fur above, a paler underside, and a long tail close to the length of the head and body.
It is nocturnal and is recorded as solitary and ground-dwelling. The Ecuador account places it in lowland rainforest and also describes its nest sites.
An extinction-risk assessment has not been added yet.