Controller can refer to several things:

• Microcontroller, a computing device
• Memory controller, logic which manages the flow of data going to and from the main memory in a computer system
• Game controller, device used for video games
• Controller (computing), a computing term
• Controller (accounting), accounting position
• Controller (control theory), in control theory
• Controller (irrigation), a device to turn irrigation systems on and off
• In comic books:
  • Controller (Marvel Comics), a Marvel Comics supervillain
  • Controller (DC Comics), an alien race in DC comics
• Animorphs Controller, in the Animorphs book and television series, a being under the control of a Yeerk parasite
• The Controller is a super-complex AI system that controls the entire world of the PlayStation 2 video game Armored Core 3

Controller | Contrôleur | Regulator