Hans Klein may refer to:
Hans Klein (1981–1944), German military aviator Hans Klein (politician) (1931–1996), German politician (CDU), member and vice president of the Bundestag Hans Hugo Klein (born 1936), German politician (CDU) in the Bundestag and justice of the Federal Constitutional Court Hans-Günter Klein (1939–2016), German musicologist, librarian, art historian, LGBT activist and researcher Hans-Joachim Klein (swimmer) (born 1942), German retired freestyle swimmer at the 1960 and 1964 Olympics Hans-Joachim Klein (1947–2022), German left-wing militant and a member of the Revolutionary Cells group Hans-Jürgen Klein (born 1952), German politician for Alliance'90/TheGreens in the Lower Saxony Landtag