Rader is a surname, and may refer to:
In law:
- Dennis Rader, American serial killer
- Randall Ray Rader, circuit judge
In religion:
- Paul Rader, the 15th General of The Salvation Army
In sports:
- Dave Rader (American football), coach of the University of Tulsa Golden Hurricane
- Dave Rader (baseball), American baseball player
- Doug Rader, former third baseman in Major League Baseball who was known primarily for his defensive ability
- Peary Rader, early bodybuilder, Olympic lifter, writer, and magazine publisher from Nebraska
In other fields:
- Devorah Rader, Ph.D. (Psychologist)
- Frank Rader, Mayor of Los Angeles from 1894 until 1896
- Erich Raeder, a Grand Admiral of the German Kriegsmarine during the Nazi era
- Gary Rader, U.S. Army Special Forces Reservist who burned his draft card