Nahum Stetson (August 21, 1807 - October 6, 1894) was a leading businessman from southeastern Massachusetts during the 19th century. He is best known for his role in establishing the Bridgewater Iron Company as one of the largest iron works in the United States during the mid-1800s. Stetson was also involved in several other iron companies throughout the southeastern New England region, as well as other notable businesses, including banks and railroads. His grandson, Nahum Stetson (1856-1933) was part of the Steinway & Sons piano company, as part of its sales team and board of directors.