- Central processing unit (CPU), an electronic circuit that can execute computer programs
- Microprocessor, a CPU on one chip as part of a microcomputer
- Graphics processing unit (GPU / VPU), a dedicated graphics rendering device for a personal computer or game console
- Physics processing unit (PPU), a dedicated microprocessor designed to handle the calculations of physics
- Digital signal processor, a specialized microprocessor designed specifically for digital signal processing
- Network processor, a microprocessor specifically targeted at the networking application domain
- Front end processor, a helper processor for communication between a host computer and other devices
- Coprocessor
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- Data processor, a system that translates or converts between different data formats
- Word processor, a computer application used for the production of printable material
- Audio processor, used in studios and radio stations
