Robert Roy MacGregor (Gaelic: Raibeart Ruadh MacGriogair; baptised 7 March 1671 – died 28 December 1734) was a Scottish outlaw, who later became a folk hero. He has been called "the Scottish Robin Hood".
Rob Roy was born at Glengyle, at the head of Loch Katrine, as recorded in the baptismal register of Buchanan Parish. His father was Donald MacGregor and his mother Margaret Campbell. In January 1693, at Corrie Arklet farm near Inversnaid, he married Mary Helen MacGregor of Comar (1671-1745), who was born at Leny Farm, Strathyre. They had four sons: James (known as Mor or Big), Ranald, Coll and Robert (known as Robin Oig or Young Rob). They also adopted a cousin named Duncan.
Along with many Highland clansmen, at the age of eighteen Rob Roy together with his father joined the Jacobite rising led by Viscount Dundee, known as Bonnie Dundee, to support the Stuart King James II who had been deposed during the Glorious Revolution of 1688. Although victorious in initial battles, Dundee was killed in 1689, deflating the rebellion. Rob's father was taken to jail, where he was held on treason charges for two years. Rob's mother Margaret's health failed during Donald's time in prison. By the time Donald was finally released, his wife was dead. The Gregor chief never returned to his former spirit or health.