Erskine ("Eric")[1] Arthur Nicolson, 3rd Baron Carnock DSO, JP (26 March 1884 – 2 October 1982),[2] styled The Honourable from 1916 until 1952, was a British peer and sailor.

[2] His mother was Mary Catharine, the daughter of Archibald Rowan-Hamilton, a soldier in the 5th Dragoon Guards.

[2] When James Lees-Milne was writing his biography of Harold Nicolson, he visited Lord Carnock, at this point in his mid-nineties and living in a Devon nursing home; he "opined that Harold was a liar and a coward and not worth a biography".

[4] In 1912, he was awarded an Officer of the Order of the Crown of Italy for his participation in the British rescue mission after the 1908 Messina earthquake.

[4] On 9 October 1919, Nicolson married Katharine Frederica Albertha, eldest daughter of Henry Lopes, 1st Baron Roborough.