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 the only son of Patrick Colquhoun, who became Lord Provost of Glasgow and was a pioneer of modern policing methods.
In 1827 he became the consul-general in the United Kingdom 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.