Thomas S. Negus (May 1, 1828 – March 17, 1894) was a 19th-century American businessman. He was well known for the manufacture and sale of maritime chronometers and nautical instruments in New York City under the name T.S. & J.D. Negus Company. He served on the Board of Pilot Commissioners for New Jersey. He died on March 17, 1894, in Jersey City, New Jersey. The firm continued in New York under the trade name "Negus" as a nautical instrument manufacturer and retailer into the 20th century.