Horstmann is a surname. Notable people with the surname include: * (1879–1947), German diplomat and art collector * August Friedrich Horstmann (1842–1929), German physical chemist * Carl Horstmann, 19th-century editor of '' The Early South-English Legendary'' * Cay Horstmann, author of several computer programming books and the creator of the Horstmann indent style *Dennis Horstmann (born 1980), German DJ and dance music artist known as Special D. * Dorothy M. Horstmann (1911–2001), American epidemiologist, virologist and pediatrician * Ignatius Frederick Horstmann (1840–1908), American Roman Catholic bishop * Kai Horstmann (born 1981), English rugby union player * Karl Horstmann (born 1967), American film director, writer and producer * Ken Horstmann (born 1971), American film and television director * Lally Horstmann (1898–1954) German writer and salonnière * Oscar Horstmann (1891–1977), American baseball player * Rolf-Peter Horstmann (1940-), German professor of philosophy * Roy Horstmann (1910–1998), American football player * Sidney Horstmann (1881–1962), British automotive engineer and businessman * Ulrich Horstmann (born 1949), German literary scholar and writer

See also