Henlein or Heinlein is a German surname. Notable people with the surname include:
Robert A. Heinlein (1907–1988), American science fiction writer
Virginia Heinlein (1916–2003), third wife of Robert A. Heinlein
Baron Max Hussarek von Heinlein (1865–1935), Austrian politician, Prime Minister of Austria in 1918
Klaus Heinlein (born 1953), German former footballer
Konrad Henlein (1898–1945), Nazi German politician
Peter Henlein (1479/80–1542), German locksmith and watchmaker, often considered the inventor of the portable timepiece
Martina Heinlein, a field hockey player in the 2008 Summer Olympics
