David Sinton (26 June 1808 – 31 August 1900) was an Irish-born American pig-iron industrialist, born in County Armagh, Ireland, who became one of the wealthiest people in America.

[3] A man of "irregular education",[4] his business interests centered on the manufacture of iron; the location of his furnaces was Lawrence County, Ohio.

His residence, at Cincinnati, was the old Longworth mansion on Pike Street, built by Martin Baum early in the 19th century.

[11] During his lifetime, Sinton was philanthropic in his donations to the arts and the Presbyterian church, yet his own father's grave was not marked with a headstone; "but David Sinton is wiser in his generation than they who seek to stab his character in such a paragraph [as erecting an ornate sepulcher].

"[12] The town of Sinton, Texas, is named in his honor (given that he was the majority stock holder in Coleman-Fulton Pasture Company[13]).