Orthmann is a surname. Notable people with the surname include:
Ernst Gottlob Orthmann (1859–1922), German gynecologist Hanna Orthmann (born 1998), German volleyball player Hans-Jürgen Orthmann (born 1954), German long-distance runner Walter Orthmann (1922–2024), Brazilian textile worker Wilhelm Orthmann (1901–1945), German physicist Winfried Orthmann (born 1935), German archaeologist specializing in the Near East
See also Ortmann