Sir George Head Barclay, KCMG, KCSI, CVO (23 March 1862 – 26 January 1921) was a British diplomat.

Among his maternal family was uncle Samuel Gurney (a member of parliament for Penryn & Falmouth);[3] aunt Catherine Gurney, who was the wife of Sir Edward Buxton, 2nd Baronet (an MP for Essex South and East Norfolk); aunt Elizabeth Gurney, who was married to Ernest Christian Ludwig de Bunsen (an Anglo-German writer);[4] and aunt Priscilla, who was married to William Henry Leatham (an MP for Wakefield and West Riding of Yorkshire South).

[5] His first cousin, Sir Maurice de Bunsen, 1st Baronet, was the British Ambassador to Spain and Austria.

[7] On 24 July 1886, Barclay joined the Foreign Office[8] and in 1888 became attaché in Washington, D.C., serving until 1891.

[10][11] He returned to the capital of the Ottoman Empire as His Majesty's Minister Plenipotentiary at Constantinople.

[16] Beatrix, an American who had been painted by John Singer Sargent in c. 1881,[17] was the daughter of Henry Grafton Chapman Jr., who served as President of the New York Stock Exchange, and the sister of noted writer John Jay Chapman.