Sir Ronald Ferguson Thomson GCMG CB FRGS (26 June 1830 – 15 November 1888) was a British diplomat.
Thomson spent his entire professional life working for the British Foreign Office in Tehran.
[1] He was appointed Secretary of Legation (third class) on 7 September 1848 and was promoted on 5 January 1852 to attaché.
In 1879 he succeeded his elder brother William Taylour Thomson in the office of Envoy Extraordinary and Ministers Plenipotentiary to Persia.
He was a Fellow of the Royal Geographical Society and was buried in the Crystal Palace District Cemetery.