Otto Karl Julius Röhm (German: [?ø?m]; 14 March 1876, Öhringen, Germany – 17 September 1939, Berlin) was one of the founders and a longtime president of the Röhm und Haas chemical company which became later in the USA the Rohm and Haas (today Dow Chemical) and in Germany the Röhm GmbH (today Evonik Degussa).