Henry Macdermott (1798 – 1 February 1848) was an Irish-born politician and merchant in the colony of New South Wales. He served as mayor of Sydney in 1845. He was a sergeant-major in the British Army.
Macdermott was born to a Protestant family in County Roscommon. His father was a British Army officer. Having enlisted in 1820, Macdermott was a sergeant with the 39th Regiment by the time he had arrived in Australia in 1827. His military career ended in 1831, having achieved the rank of sergeant-major. He was elected as an alderman for the City of Sydney in November 1842. He was mayor in 1845, before resigning from council in August 1847 due to bankruptcy.[1]
In 1837, Macdermott married Catherine Small in Sydney. The couple had at least five children.[2] He died on 1 February 1848, aged 49.[1] [3]