Arthur Nicolson, 1st Baron Carnock, GCB, GCMG, GCVO, KCIE, PC (19 September 1849 – 5 November 1928), known as Sir Arthur Nicolson, 11th Baronet, from 1899 to 1916, was a British diplomat and politician during the last quarter of the 19th century to the middle of World War I.

[1] Born in London,[2] he was the eldest son of Admiral Sir Frederick Nicolson, 10th Baronet by his wife Mary Loch.

Educated at Rugby and Brasenose College, Oxford, where he left without taking a degree, he succeeded his father as Baronet in 1899.

[3] From 1870 to 1874, he worked in the Foreign Office, during which time he was author of the History of the German Constitution (1873).

From 1906 to 1910, he was the British Ambassador to Russia in Saint Petersburg, followed by the Permanent Under Secretary for Foreign Affairs from 1910 to 1916.