Altmann is a surname. Notable people with the surname include:
Alexander Altmann (1906–1987), Hungarian-American professor of Judaic studiesDora Altmann (1881–1971), German actressElisabeth Altmann-Gottheiner (1874–1930), the first female German University lecturerGila Altmann (born 1949), German politician and member of the Green PartyK. Johanna (Joana) Altmann, (born 1971), German spanish inventor, editor, journalist, business leader and art collectorMaria Altmann, the plaintiff in Republic of Austria v. AltmannRichard Altmann (1852–1900), German pathologistRos Altmann, British pensions campaignerWilhelm Altmann (1862–1951), German historian