Kiisortoqia soperi is an extinct species of arthropod from the Early Cambrian Sirius Passet Lagerstätte in Greenland.

[1] The head plate was simple, convex in shape, wider than long, and represented about 20% of the total body length.

The specific epithet is in honor of Norman John (Jack) Soper who, together with A. K. Higgins, discovered the Sirius Passet fauna and collected the first fossils from the locality.

[1] More than 170 specimens of the species were recovered in the course of several expeditions between 1985 and 2006 from the Lower Cambrian Sirius Passet Konservat-Lagerstätte, in Peary Land, northern Greenland.

An exact position within the arthropods, however, cannot be determined, due to the possible lack of eyes and the ambiguous shape of the tail plate.

[2] A later study also suggested it was closely related to the morphologically similar Bushizheia known from the Chengjiang Biota of China.