In computer hardware, a '''controller''' may refer to:
* Memory controller, a unit that manages access to memory * Charge controller * Game controller, a device by which the user controls the operation of the computer * Host controller * Sound controller * Network controller * Graphics controller or video display controller * SCSI host bus adapter * Parallel port controller * Microcontroller unit (MCU) * Keyboard controller * Programmable Interrupt Controller * Northbridge (computing) * Southbridge (computing) * Universal asynchronous receiver/transmitter (UART) communications controller chip * Peripheral DMA controller * Disk controller * Floppy disk controller * Disk array controller, also known as a RAID controller, a type of storage controller * Flash controller, or SSD controller, which manages flash memory * Storage controller * Terminal Access Controller * IBM 2821 Control Unit, used to attach card readers, punches and line printers to IBM System/360 and IBM System/370 computers * IBM 270x and IBM 37xx, used for telecommunications * IBM 3271, 3272, 3271, and 3174, used to attach terminals (display devices) * MIDI controller * Programmable logic controller
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