Admiral of the Fleet Sir William Parker, 1st Baronet, GCB (1 December 1781 – 13 November 1866), was a Royal Navy officer. As a captain's servant he took part in the Battle of The Glorious First of June in June 1794 during the French Revolutionary Wars and, as a captain, he participated in the capture of the French ships "Marengo" and "Belle Poule" at the action of 13 March 1806 during the Napoleonic Wars. He was detached on an independent command on the Tagus in September 1831 with a mission to protect British interests during the Portuguese Civil War. As Commander-in-chief of the East Indies and China Station, he provided naval support at various actions between 1841 and 1842 during the First Opium War. Appointed Commander-in-Chief, Mediterranean Fleet in February 1845, he was briefly (for a week) First Naval Lord in the First Russell ministry from 13 July 1846 to 24 July 1846 but gave up the role due to ill health before returning to his command with the Mediterranean Fleet.