Matthew Whitworth-Aylmer, 5th Baron Aylmer, (24 May 1775 – 23 February 1850) was a British Army officer and colonial administrator.
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Napoleonic Wars
Aylmer was gazetted ensign in 1787, lieutenant in 1791 and major in 1800, after being held in a French prison for six months in 1798. His career continued as colonel in 1810, being aide-de-camp to King George III between 1810 and 1812 and then major general in 1813. He was present at most of the battles in the Peninsular War.
In 1814, following service in the French Revolutionary Wars and the Napoleonic Wars, he was appointed adjutant general of British forces in Ireland, where he remained until 1823.
North American administration
After reaching the position of lieutenant-general in 1825, Aylmer was, in 1830, appointed commander of British military forces in North America as well as Governor General of British North America and Lieutenant Governor of Lower Canada.




