Erebiola butleri, or Butler's ringlet, is an elusive New Zealand endemic butterfly, discovered in 1879 by John Enys at the alpine pass at the head of the Rakaia River.

Erebiola is derived from Erebus, the ancient Greek world of darkness between Earth and Hades, while the specific name, butleri, was after Arthur Gardiner Butler of the British Museum who played a major role in early descriptions of New Zealand butterflies.

Both the underside and the topside of the wings have eyespots at the distal-most ends, surrounded by reddish-brown shading.

The larvae are similar coloured from head to tail, being yellow brown with dark and light lateral striping.

The pupa is grey and cream with fine black spotting along the abdomen, changing to a brown on the rest of the body.