Stewart Clark JP, DL (2 January 1830 – 21 November 1907) was a Scottish businessman and Liberal Party politician. Stewart Clark was a thread manufacturing entrepreneur. In the 18th century James and Patrick Clark started a thread business which expanded to the United States in the 19th Century. In 1952 the firm merged with J&P Coats forming what has since been renamed the Coats Group. Clark was a Justice of the Peace in Linlithgow and was the Deputy Lord Lieutenant for Renfrewshire. Clark was the Member of Parliament (MP) for Paisley from 1884 to 1885.