Sir Malcolm Arnold Robertson GCMG KBE PC (2 September 1877 – 23 April 1951) was a British diplomat and politician.

[7] Robertson served as chargé d'affaires at Rio de Janeiro, and on 3 June 1915 was appointed a Companion of the Order of St. Michael and St.

[9] Their only child, Donald Struan Robertson, served in the Scots Guards, rising to the rank of major.

[13] On 3 June 1924 Robertson, now Minister at Tangier, was made a Knight Commander of the Order of the British Empire.

[15] On 26 May 1927 he became a Privy Councillor,[16] and on 9 July 1927 was appointed Ambassador Extraordinary and Plenipotentiary to the Argentine Republic.