Mainzer is a surname. Notable people with the surname include:
Amy Mainzer (born 1974), American astronomer Ferdinand Mainzer (1871–1943), German-Jewish gynaecologist and historical author Klaus Mainzer (born 1947), German scholar and philosopher Klaus Mainzer (rugby union) (born 1979), German international rugby union player Otto Mainzer (1903–1995), German-American writer
See also
Maizeray Maizerets Maizeroy Maizery Manzur Minzier Munzer Münzer