David Henry Arthur Nicolson, 4th Baron Carnock (10 July 1920 – 26 December 2008) was a British peer and solicitor.
Nicolson served in the Royal Devon Yeomanry, reaching the rank of major and fought in the Second World War.
On 2 October 1982, he succeeded to his father's titles and became Chief of Clan Nicolson.
Two years later the dormant Baronetcy, of Lasswade in the County of Midlothian was revived in his favour.
He was succeeded by his cousin, the writer Adam Nicolson.