Euphemia Elphinstone (also written Euphame or Eupheme; born 11 May 1509) was a mistress of James V of Scotland and the mother of his son Robert Stewart, 1st Earl of Orkney, born in 1532, as well as another child who died in childhood. One of her sons with her husband John Bruce was Laurence Bruce of Cultmalindie (1547–1617), the builder of Muness Castle. She was the second daughter of Alexander Elphinstone, 1st Lord Elphinstone and Elizabeth Barlow or Barlay (c. 1476 – 10 September 1518), an English woman of the household of Margaret Tudor.