Harry Seawell Frank Niblett, CVO (31 October 1852 – 26 December 1939) was a Royal Navy officer before the First World War.

Niblett entered the Royal Navy, was promoted to lieutenant on 31 March 1874,[1] and to commander on 1 January 1887.

In December 1902 he was appointed commodore-in-command of the Royal Naval Barracks, Devonport, and captain of HMS Vivid, flagship and yacht to the port admiral.

[4] Three years later he was promoted to rear-admiral on 1 January 1905, and in late 1906 he was appointed in command of the Devonport Reserve division.

[5] He was appointed a Commander of the Royal Victorian Order (CVO) in August 1907, on the occasion of the Inspection by King Edward VII of the Home Fleet.