Uchter John Mark Knox, 5th Earl of Ranfurly GCMG GCStJ PC (Ire) JP DL (14 August 1856 – 1 October 1933), was a British politician and colonial governor.

[1] Becoming a cadet on board HMS Britannia, he passed for the Royal Navy, but, giving up a naval career, entered Trinity College, Cambridge, at the age of eighteen.

His family had owned a large country estate centred on Dungannon in the southeast of County Tyrone in Ulster since 1692.

He was appointed to succeed The Earl of Glasgow as Governor of New Zealand on 6 April 1897, assuming office on 10 August.

In 1927, the Earl sold Northland House in Dungannon and the family's other possessions in County Tyrone due to "heavy post-war taxation".