Buenaspis is a genus of small ( 1 to 3 centimetres (0.39 to 1.18 in) long) nektaspid arthropod, that lived during the early Cambrian period.

[1] Fossil remains of Buenaspis were collected from the Lower Cambrian Sirius Passet Lagerstätte of North Greenland.

The name of the genus is derived from the Buen Formation, the deposit where the species was collected, and the Greek word aspis (shield).

[1] Buenaspis forteyi is between 1 and 3 cm along the axis, approximately half a wide as long, in general outline shaped as a bar with parallel sides and rounded front and back ends.

Recently however, Paterson et al. propose to remove Buenaspis from the order Nektaspida entirely, on the argument that it lacks the 'waist' that is a common feature in Liwia, Soomaspis, Tariccoia, Misszhouia, Pseudonaraoia and Naraoia.