Field Marshal John Campbell, 5th Duke of Argyll (June 1723 – 24 May 1806), styled Marquess of Lorne from 1761 to 1770, was a Scottish soldier and nobleman.
Born the son of John Campbell, 4th Duke of Argyll and Mary Bellenden, the daughter of John Bellenden, 2nd Lord Bellenden of Broughton, Campbell was commissioned into the 21st Royal Scots Fusiliers in 1744. He served in the response to the Jacobite Rebellion at the Battle of Falkirk and the Battle of Culloden in 1746.
In 1749 he became Commanding Officer of the 42nd Regiment of Foot serving in Ireland.
He became a member of Parliament and was made a field marshal on 30 July 1796.
In 1759 he married Elizabeth, Dowager Duchess of Hamilton. They lived in Inveraray Castle, and had issue:
- Lady Augusta Campbell
- George John Campbell, Earl of Campbell (1763–1764)
- George Campbell, 6th Duke of Argyll (1768–1839)
- Lady Charlotte Campbell (1775–1861)
- John Campbell, 7th Duke of Argyll (1777–1847).