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James Colquhoun (7 June 1780 – 23 July 1855) was a British diplomat who represented the interests of various German cities in Great Britain.
He was private secretary to Henry Dundas in 1806. In 1809, he was Deputy Agent-General for the payment of volunteers organized under the Volunteer Act 1804 (44 Geo.3 c.54) for the defence of Britain in the Napoleonic Wars.
Between 1817 and 1855 he was Consul-General in Great Britain for the Hanseatic cities of Hamburg, Bremen and Lübeck, signing commercial treaties on their behalf not just with Britain but with various other countries. In 1827 he became the consul-general in England representing King Anton of Saxony, and in 1848, he was appointed by Augustus, Grand Duke of Oldenburg to be his chargé d'Affaires in London. He received the star of a Commander of the Royal Saxon Order of Civil Merit, and assumed the title of Chevalier de Colquhoun. At various times he also represented the interests of the legislatures of Saint Vincent and other West Indies islands.
He had three sons and two daughters; his eldest son Patrick Colquhoun was a lawyer and a rower, and followed in his footsteps as a diplomat representing German cities.
- "Appendix to Chronicle: Deaths—July: the Chevalier James de Colquhoun". The Annual Register, 1855. London: F. & J. Rivington. p. 295.
- "Obituary: The Chevalier de Colquhoun". The Gentleman's magazine (London: John Bowyer Nichols & Sons) 199: 435. October 1855.
- "Colquhoun, James (CLKN797J)". A Cambridge Alumni Database. University of Cambridge.