Thomas Ewbank (11 March 1792 – 16 September 1870) was an English writer on practical mechanics, who was United States Commissioner of Patents from 1849 to 1852.
In 1819 he emigrated to America, and next year began business in New York City as a manufacturer of lead, tin, and copper tubing.
He was appointed United States Commissioner of Patents by President Taylor in 1849.
Ewbank also wrote a number of scattered papers on scientific subjects.
His 'Experiments on Marine Propulsion, or the Virtue of Form in Propelling Blades,’ attracted some attention in Europe.