Hahnemann is a German surname. Notable people with the surname include:

• Elizabeth Cuthill, née Elizabeth Hahnemann (1923–2011), American mathematician
• Helga Hahnemann (1937–1991), East German actress
• Marcus Hahnemann (born 1972), American soccer player
• Mélanie Hahnemann (1800–1878), French physician
• Paul G. Hahnemann (1912–1997), German automobile industry manager
• Samuel Hahnemann (1755−1843), German physician, founder of homeopathy
• Wilhelm Hahnemann (1914−1991), Austrian-German football player and coach

• Hahnemann University Hospital, Philadelphia
• Hahnemann University, Philadelphia-based institution, precursor to Drexel University College of Medicine
• Hanneman
• Hahnaman, Illinois