Ruth Mackay (9 May 1878 – 31 March 1949) was a British stage and silent film actress.

[2] She was born in Kennington in London in 1878, the daughter of David McDonald MacKay (1839–1910) and Florence née Dignam (1846–).

In 1905 Mackay married the actor Eille Norwood; they were to remain together until his death.

[8] In her later years, she lived with her husband at Corner Cottage, Waverley Lane in Farnham in Surrey.

Ruth Mackay Brett died in Westfields Nursing Home in Whitstable in Kent.