Máel Ruba, Máelrubai (Old Irish spelling), Maol Rubha (MoRubha/MaRuibhe) (Scottish Gaelic spelling), or Malruibhe (642–722), sometimes Latinised as Rufus, is an Irish saint of the Christian Church. Originally from Bangor, County Down, Ireland, he was a monk and founded the monastic community of Applecross in Ross, one of the best attested early Christian monasteries in what is now Scotland.
Máelrubai was descended from Niall, King of Ireland, via his father Elganach. His mother, Subtan, was a niece of Saint Comgall (d. 597 or 602) of Bangor. Máelrubai was born in the area of Derry and was educated at Bangor. In 671, when he was thirty, he sailed from Ireland to Scotland with a group of monks.
For two years he travelled around the area, chiefly in Argyll, perhaps founding some of the many churches still dedicated to him, before settling at Aporcrosan (Applecross) in 673, in Pictish territory in the west of Ross opposite the islands of Skye and Raasay. Thence he set out on missionary journeys: westward to the islands Skye and Lewis, eastward to Forres and Keith, and northward to Loch Shin, Durness, and Farr.