List of criminals in Criminal Minds. Keep in mind that the articles accessible below will contain spoilers.
For minor criminals mentioned, see here.
Serial Killers
For all serial killers (including serial-turned-spree killers and serial rapists-turned-killers), see here.
Rampage Killers
Budding Serial Killers
Budding Spree Killers
Proxy Killers
Attempted Murderers
Serial Bombers
Serial Arsonists
Serial Rapists
Pedophiles
Cult Leaders
Abductors
Gangsters
Criminal Teams/Families
Groups and Organizations
Other Criminals
Accomplices
Terrorists
International Criminals