Wiedemann is a German surname. Notable people with the surname include:
Barbara Wiedemann (born 1945), American poetChristian Rudolph Wilhelm Wiedemann (1770–1840), German physician, historian, naturalistElisabeth Wiedemann (1926-2015), German actressFerdinand Johann Wiedemann (1805–1887), Baltic German linguistFritz Wiedemann (1891–1970), German soldier, Nazi Party activist and diplomatGeorge Wiedemann (1833–1890), German American brewerGustav Heinrich Wiedemann (1826–1899), German physicistKent M. Wiedemann, American diplomatElettra Rossellini Wiedemann (born 1983), American fashion modelThorsten Wiedemann (born 1985), German rugby union player