Rehder is a German surname. Notable people with this surname include the following:
- Alfred Rehder (1863-1949), German horticulturist
- Elke Rehder (born 1953), German artist
- Harald Alfred Rehder (1907–1996), American malacologist
- Heinrich Rehder (1887-unknown), German athlete
- Lois Corea Rehder (1911–1988), from the USA, spouse of Harald Alfred Rehder
- Patrícia Rehder Galvão, known as Pagu (1910-1962), Brazilian poet, journalist and translator.
- Tom Rehder (born 1965), American football player