Archibald Campbell Colquhoun (8 September 1756[1][2] – 8 December 1820) was a Scottish politician and lawyer from Glasgow.

On succeeding to the estate of Killermont upon the death of his father in 1804, he assumed the additional surname and arms of Colquhoun.

and Henry Cockburn were actually chosen deputes by Lord Melville before Colquhoun had received the appointment.

[3] Colquhoun, as the Lord Advocate, took part in reforming the constitution of the Court of Session, and was appointed one of the thirteen commissioners who sat for the first time on 30 November 1808 for the purpose of inquiring into the administration of justice in Scotland.

[6] Colquhoun died on 8 December 1820, after an illness of a few days, at the house of his son-in-law, Walter Long, at Hartham, Wiltshire, and was buried in the parish churchyard of New Kilpatrick near Glasgow.

[3] They had six daughters and two sons: Their eldest child died within a year of her birth, and it was on this occasion that Carolina Oliphant, afterwards Baroness Nairne, wrote The Land of the Leal, which she sent to her old friend Mrs.