Orobdella masaakikuroiwai is a species of proboscisless leech from Japan.

[1] The name is a contraction of Masaaki Kuroiwa, who was part of the survey of the Nagano Prefecture.

[1] Mature individuals are smaller than 4 centimetres (1.6 in) long, making them one of the smallest species in their genus beside O. koikei.

[1] Individuals are usually found in moist areas, usually under stones or leaves.

[1] Due to the discovery of soil particles in the leeches' digestive tracts, Nakano (2014) concluded that the species feeds on earthworms like other members of the genus Orobdella.