Heidemann is a German surname. Notable people with the surname include:
Britta Heidemann (born 1982), German épée fencerDirk Heidemann (born 1961), German ballroom dancer, fashion model, now author, dance sport coach and choreographerGaille Heidemann, American voice actressGünther Heidemann (1932–2010), boxer from GermanyGerd Heidemann (born 1931), German journalist known for his role in the publication of forged Hitler DiariesHartmut Heidemann (born 1941), German football playerJørgen Heidemann (born 1946), Danish handball playerJack Heidemann (born 1949), former right-handed Major League Baseball shortstopLavon Heidemann (born 1958), non-partisan member of the Nebraska LegislatureMatthias Heidemann (1912–1970), German footballerStefan Heidemann (born 1961), German orientalist at Hamburg University