Rahmer is a surname. Notable people with the surname include:
Moritz Rahmer (de) (1837–1904), German rabbi and publicist Sigismund Rahmer (de) (1866–1912), Jewish German doctor, writer and editor Hans Sigismund Rahmer (English: John Rayner; 1924–2005), German-English Liberal rabbi Will Rahmer (born 1969), American musician and vocalist
See also Rohmer