Rohm and Haas Company, a company in Philadelphia, Pennsylvania, manufactures miscellaneous materials. Formerly a Fortune 500 Company, Rohm and Haas employs more than 17,000 people in 27 countries, with its last sales revenue reported as an independent company at USD 8.9 billion. On July 10, 2008, The Dow Chemical Company agreed to buy Rohm and Haas for $17.29 billion and completed the acquisition on April 1, 2009.

The company was founded in Esslingen, Germany, by Dr. Otto Röhm and Mr. Otto Haas in 1907. Haas moved to Philadelphia and began the American side of the business on September 1, 1909, from an office on Front Street, while Otto Röhm remained in Germany to run a company that would eventually become Röhm GmbH. The American company grew rapidly as World War I approached, because of their initial invention, a synthetic substitute (brand name Oropon) for fermented dog dung, which was used for bating leather (part of the old tanning process); leather was needed for the war in large quantities for belts and saddles.