Sergeant Joseph M. Darby (born c. 1979) is a former U.S. Army Reservist known as the whistleblower in the Abu Ghraib torture and prisoner abuse scandal.

Darby is a graduate of North Star High School, near his hometown at the time, Jenners, Pennsylvania.

In January 2004, Darby provided two CD-ROMs of photographs to Special Agent Tyler Pieron of the U.S. Army Criminal Investigation Command, who was stationed at Abu Ghraib Prison, triggering an investigation that led to the implication of several soldiers violating the Geneva Convention.

[5] Darby had agonized for a month beforehand, but finally decided to blow the whistle on his former friends explaining: "It violated everything I personally believed in and all I'd been taught about the rules of war."

[3] They have been shunned by friends and neighbors, their property has been vandalized, and they now reside in protective military custody at an undisclosed location.