Richard Lenel (1869–1950), chairman of the chamber of commerce and honorary citizen of the city of Mannheim, Germany
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Otto Lenel (1849–1935), German Jewish jurist and legal historian
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Lenel Systems International, a subsidiary of United Technologies Corporation, and a leading provider of software and integrated systems for the corporate security market
The grandfather on the mother's side of Ludwig Lenel was the Prussian democrat Friedrich Kapp (1824–1884), who emigrated to the USA, but returned later and became a national-liberal deputy to the German Reichstag and a friend of Bismarck.