Sir Duncan Campbell, 2nd Baronet

Sir Duncan Campbell (19 October 1583–1 February 1645), 2nd Baronet and 6th Lord of Auchinbreck, was a Scottish landowner and soldier. He was commander of the Marquess of Argyll, Archibald Campbell's troops, (Covenanters) in Ireland.

He was a son of Sir Dugald Campbell, 1st Baronet of Auchinbreck and Mary Erskine. He was recalled by Archibald Campbell to Scotland and placed in command of the Covenanter troops at the Battle of Inverlochy (1645).

Duncan Campbell was born circa 1597 in Colquhoun, Dunbartonshire, Scotland. He was the second son of Dugald Campbell of Auchinbreck and Mary Erskine, and succeeded him in 1641. He bought Carnasserie Castle from the Marquess of Argyll in 1643.

He served in Parliament for Argyllshire from 1628 to 1643.

During the Irish Wars of the early 1640s, Campbell led his Covenanter troops from Argyll in the massacre of many local Catholic MacDonalds on Rathlin Island. On 2 February 1645, back in Scotland, he led Argyll’s troops at Inverlochy where he was taken prisoner and killed, probably in retaliation for his massacre of the Catholic MacDonalds a few years earlier.