Dysoptus denticulatus is a species of moth in the family Arrhenophanidae. It is known only from Brazil, São Paulo, Boracéia Field Station, and Casa Grande.
The length of the forewings is about 5 mm for males. Adults are on wing in February (based on one record).
The specific name is derived from the Latin denticulatus (with small teeth), in reference to the denticulate apex of the saccular process in the male valva.