Wolffsohn's viscacha (Lagidium wolffsohni), pronounced "wolf-sewns vi-skah-chuh", and locally known as chinchillón anaranjado, is a rare species of rodent in the family Chinchillidae.

However, Oldfield Thomas, on behalf of the British Museum, named it Wolffsohni in recognition of Wolffsohn's contributions to the study of the species.

The coat is characterized by a wool-like texture, with hair lengths varying between 35 and 50 mm.

It is easily identifiable by its orange-clay coloration, short black ears, and distinctly bushy tail.

Grasses, including Festuca pallescens, as well as genera Pappostipa and Poa, comprise 60.4% of its diet.