Lieutenant-Colonel Melchior Guy Dickens (bapt. 18 February 1696 – 1775) was a British diplomat, minister to Prussia and Sweden and ambassador to Russia.
From 1724 to 1730 he was Secretary at the British embassy to Prussia at Berlin; officially appointed Secretary to the Prussian Court in 1730,[1] he seems to have acted as chargé d'affaires there until 1740. In August 1732 he was briefly at Hanover.[2] In 1740 he was promoted to be minister. He left Prussia in May 1741.[3] In June 1742 he arrived in Stockholm as Minister to the Swedish Court.[4] In 1749 he became ambassador to Russia.[5]