Alcidedorbignya is an extinct pantodont mammal known from the Early Paleocene (Tiupampan SALMA, 65.5 to 61.7 million years ago) Santa Lucia Formation (18°00′S 65°36′W / 18.0°S 65.6°W / -18.0; -65.6, paleocoordinates 20°42′S 52°30′W / 20.7°S 52.5°W / -20.7; -52.5)[1] at Tiupampa near Mizque, Cochabamba, Bolivia.

[4] Estimated 25 cm head-body length and 500 grams, this was a small squirrel sized animal, terrestrial with possible scansorial habits, and either herbivorous or omnivorous.

[8] Alciddedorbignya is known from several specimens of upper and lower dentitions, including juveniles.

P3–4 have V-shaped ectolophs (ridges on the crowns), indicating it was a primitive pantodont.

It is still unclear which the primitive condition is in pantodont upper dentition, and the position of Alcidedorbignya near the base of the clade remain unresolved.