Controller

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Occupations

Controller or financial controller, or in government accounting comptroller, a senior accounting position
Controller, someone who performs agent handling in espionage
Air traffic controller, a person who directs aircraft

Control theory, control of continuously operating dynamical systems in engineered processes and machines
- Irrigation controller, a device to automate irrigation systems
- PID controller, a control loop feedback mechanism
Control loop, contains all the control elements for controlling a process variable
- Anti-lock brake controller, in an anti-lock braking system
Industrial control system, a general term used in industrial process control
Proportional control, a type of linear feedback control system

Controller (comics), multiple characters
- Controller (Marvel Comics), a fictional character in Marvel Comics
- Controllers (DC Comics), a fictional extraterrestrial race in the DC Universe
The Fat Controller (Sir Topham Hatt), the head of the railway in The Railway Series of books written by the Reverend W.V. Awdry, also The Thin Controller and The Small Controller on other railway lines in those books
Controller, a being controlled by a Yeerk in the Animorphs series by K.A. Applegate
The Controller, an AI system in the Armored Core 3 video game

The Controllers (Los Angeles band), a punk rock band
The Controllers (R&B band), a 1980s rhythm-and-blues band
Controller (Misery Signals album), 2008
Controller (British India album), 2013
"Controller" (song), a 2017 song by New Zealand L.A.B.
MIDI controller, a device which generates MIDI data
Nick Rhodes (born 1962), English keyboardist and producer
"Controller", a song from the 1981 album Only a Lad by the new-wave band Oingo Boingo