Sir Duncan McCallum (24 November 1888 – 10 May 1958) was a Scottish Conservative politician. He was elected Member of Parliament (MP) for Argyllshire at a 1940 by-election. McCallum remained as MP for the seat (renamed Argyll in 1950) until his death in 1958.
McCallum was born on 24 November 1888 in Fulham, London, son of Charles Whitton McCallum (the British music entertainer known as Charles Coborn). McCallum was educated at Filey School, and Christ's Hospital. He won a Military Cross and was Mentioned in Despatches in the First World War during which his service took him to the Cameroons and to France. The years that followed the end of hostilities were scarcely less adventurous for him, for between 1920 and 1924 he was British liaison officer with the French in Syria and took part in a pioneering journey across the Syrian Desert in 1923. A party consisting of Mr. Palmer, Consul in Damascus, Mahommed Ibn Bassam, a gold trader, and McCallum drove from Syria to Baghdad in three cars, a Buick, an Oldsmobile, and a Lancia. This was the first official reconnaissance of the trans-desert route.