Altmann is a surname. Notable people with the surname include:
Alexander Altmann (1906–1987), Hungarian-American professor of Judaic studies
Dora Altmann (1881–1971), German actress
Elisabeth Altmann-Gottheiner (1874–1930), the first female German University lecturer
Gila Altmann (born 1949), German politician and member of the Green Party
K. Johanna (Joana) Altmann, (born 1971), German spanish inventor, editor, journalist, business leader and art collector
Maria Altmann, the plaintiff in Republic of Austria v. Altmann
Richard Altmann (1852–1900), German pathologist
Ros Altmann, British pensions campaigner
Wilhelm Altmann (1862–1951), German historian
