Reder is a German surname. Notable people with the surname include:
- Bernard Reder (1887–1964), artist from Czernowitz, Bukovina
- Kristiaan Reuder or Christian Reder, German painter
- Deanna Reder, Canadian academic
- Gigi Reder born Luigi Schroeder;, Italian actor
- Hedwig Reder maiden name of Hedwig Kettler, German women's rights activist
- Johnny Reder (1909–1990), Polish-American sportsman
- József Réder, Hungarian boxer
- Peter Reder, British artist
- Rudolf Reder a.k.a. Roman Robak, concentration camp survivor
- Walter Reder (1915–1991), German SS officer
