Lieutenant-General William Barrell (died 9 August 1749) was a British Army officer.

Career Barrell joined the English Army as a captain on 27 March 1698.A List of the Colonels, Lieutenant Colonels, Majors, Captains, Lieutenants, and Ensigns of His Majesty's Forces (1740) p. 18. He served with distinction in the War of the Spanish SuccessionRichard Cannon, Historical Record of the Fourth, or King's Own Regiment of Foot (1839) p. 148.Richard Cannon, Historical Record of the Twenty-Second, or the Cheshire Regiment of Foot (1849) p. 52. and was granted brevet rank as a colonel of Foot by the Duke of Marlborough on 1 January 1707.Charles Dalton, English Army Lists and Commission Registers 1661-1714, volume VI (1904) p. 194. In 1715 he was made colonel of the 15th Regiment of Foot, and in 1727 he was promoted to brigadier-general. On 25 August 1730 he was removed to the 22nd Regiment of Foot, and on 8 August 1734 to the King's Own. He was promoted to major-general in 1735 and lieutenant-general in 1739; he also held the post of Governor of Pendennis Castle.

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