Gerhard Moritz Roentgen (* 7 May 1795 in Esens in Ostfriesland; † 28 October 1852 in Santpoort near Velsen in North Holland) was a Dutch Navy officer, machine building engineer and ship builder. As of 1823 he was involved in founding the Nederlandsche Stoomboot Maatschappij (NSM). At first he was one of NSM two chief executives. Later on, he was the only executive till 1849. The invention of the marine compound steam engine is Roentgen's main scientific achievement.