Captain Thomas Drummond (1797–1840) was a Scottish civil engineer who was the inventor of the Drummond light which was employed in the trigonometrical survey of Great Britain and Ireland. A supporter of the Whigs, he helped with the work preparatory to the great Reform Bill of 1832 and he was later rewarded with the post of Irish Under-Secretary, a position he held from 1835 until his death in 1840.
- Property has its duties as well as its rights.
- Letter to the Landlords of Tipperary, May 22, 1838. See also Benjamin Disraeli, Sybil, book i. chapter xi.