Thomas C. Cornell (January 27, 1814 – March 30, 1890) was an American politician and businessman. During the American Civil War, he was commissioned as a major in the New York Militia. He served two terms in Congress running on the Republican Party line, first from 1867 to 1869, and again from 1881 to 1883.
He was born in White Plains, New York on January 27, 1814 to Peter Cornell (1780–1860) and Margaret Gedney (1786–1829). He was a descendant and namesake of Thomas Cornell, the progenitor of the Cornell family in North America.
After attending public schools, Thomas C. Cornell was drawn to Rondout, N.Y. by his uncle, Thomas W. Cornell, Peter's brother. Thomas W. came to the Rondout area in 1822 and opened a general store in New Salem. When the Delaware and Hudson canal opened in 1828 his business grew rapidly.
In the 1830s, Thomas C. Cornell worked for David P. Mapes of Coxsackie, NY. Mapes' enterprises foreshadowed Cornell's business success. Mapes owned the sidewheeler General Jackson which had the contract to haul barges for the D&H Canal Company and he also owned a stage line running from Rondout into the Catskills.
In 1837, with his own sloop, Cornell started what was to become the Cornell Steamboat Company. In 1850, he obtained the contract for towing D&H Canal Company barges. Following the Civil War, the Cornell Steamboat Line virtually monopolized freight traffic on the Hudson River, dominating the towing of barges well into the 1900s. While the Steamboat Company was the heart of his empire, Cornell engaged in many other related enterprises.
In 1866, he incorporated what was to become the Ulster and Delaware Railroad (U&D). He was involved in the construction and operation of several other railroads including the Wallkill Valley and the Rhinebeck and Connecticut Railroad.