Blechnum socialis is a species of fern in the Blechnaceae family. It is endemic to Pichincha Province and Azuay Province, Ecuador, but has not been seen for 100 years. The name socialis indicates that they form in colonies. Its natural habitat is subtropical or tropical high-altitude shrubland. It is threatened by habitat loss for fires and grazing and it is possible it occurs in Reserva ecológica Cotacachi-Cayapas and Reserva ecológica Antisana.