Lagemann is a German surname and can refer to the following people:
Ramana Lagemann, an American rally car driver
Rainer Lagemann, a German metal sculptor and photographer
Hanns Hermann Lagemann (1924–2003), a German politician (CDU), member of the Landtag of North Rhine-Westphalia
Inge Lagemann (1944–2014), a German politician (SPD), member of the Landtag of North Rhine-Westphalia
Johann Jakob Lagemann (1696–1766), a German gunsmith famous for making breech-loading wheellock sporting rifles in Vollmarshausen, Germany
Sigrid Lagemann (1924–1992), a German actress and voice actress
