Colin Campbell, 6th Earl of Argyll (c. 1541/1546 – October 1584) was a Scottish nobleman and politician. He was appointed to the Lord Chancellorship of Scotland.
He was the eldest son of Archibald Campbell, 4th Earl of Argyll and his second wife Margaret Graham. He was also a younger paternal half-brother of Archibald Campbell, 5th Earl of Argyll. His maternal grandparents were William Graham, 3rd Earl of Menteith and Margaret Moubray.
Argyll was first married to Joan Stewart, daughter of Henry Stewart, 1st Lord Methven and his second wife Janet Stewart. Her maternal grandparents were John Stewart, 2nd Earl of Atholl and Lady Janet Campbell. Janet was a daughter of Archibald Campbell, 2nd Earl of Argyll and Elizabeth Stewart. Elizabeth was a daughter of John Stewart, 1st Earl of Lennox and Margaret Montgomerie. Margaret was a daughter of Alexander Montgomerie, 1st Lord Montgomerie and Margaret Boyd.
He married secondly Lady Agnes Keith. She was a daughter of William Keith, 4th Earl Marischal and his wife Margaret Keith. Her maternal grandfather was Sir William Keith. They had three children:
- Archibald Campbell, 7th Earl of Argyll (c. 1575–1638).
- Sir Colin Campbell of Lundie (died c. 1650).
- Jane Campbell
The 6th Earl of Argyll is buried at Kilmun Parish Church.