Erica mackayana,[note 1] also known as Mackay's heath, is a species of flowering plant in the family Ericaceae.

It grows numerous branchlets which are densely covered in small leaves which are elliptical to oblong-lanceolate in shape and arranged in a whorl of four.

[7]: 319 The flowers vary between bright reddish purple and rose pink in colour and are generally paler on the side of the plant which is more shaded.

[13] Micheline Sheehy Skeffington suggests that the species was brought to Ireland in the medieval period, potentially through trade, smuggling, or by pilgrims returning from Santiago de Compostela.

[14] In D. A. Webb's 1955 article on E. mackayana, he notes populations occurring from Mondoñedo in the west to Cabezón de la Sal in the east.

It has been found at Lough Nacung Upper, Bellacorick, Nephin Beg, Roundstone Bog, Carna, and Caunoge in Kerry.

In Spain, where the species has a wider range, it associates with Ulex europaeus, Daboecia cantabrica, Molinia caerulea, Potentilla erecta, Erica vagans, Blechnum spicant, and Pteridium aquilinum.