Admiral Sir George Nathaniel Broke-Middleton, 3rd Baronet (26 April 1812 – 14 January 1887) was a British Royal Navy officer.
Broke-Middleton was the second son of Sir Philip Broke, 1st Baronet, and Louisa Middleton. He entered the Royal Navy as a midshipman on 16 August 1825. By 4 November 1840 he had gained the rank of Commander while serving on HMS Thunderbolt. On 18 December 1845, he was promoted to the rank of Captain, and in 1855 took command of HMS Gladiator, seeing active service in the Crimean War. In 1858, Broke took command of HMS Centurion, and in March 1859 became captain of HMS Hero. The following month he was invalided out of regular naval service. He was promoted to the rank of retired Admiral on 22 January 1877.
On 4 February 1855, he succeeded to his older brother's baronetcy. In 1860, Broke assumed the additional surname of Middleton after inheriting the estate of his cousin, Sir William Fowle Fowle Middleton. In 1864, he served as High Sheriff of Suffolk. He died unmarried and baronetcy became extinct.
His Suffolk estates were inherited by a niece, Lady de Saumarez, formerly Jane Anne Broke, the daughter of his brother Captain Charles Acton Broke. In 1882, she had married James Saumarez, 4th Baron de Saumarez, and the estates thus passed into the Saumarez family.