COSMAC may refer to:
The RCA (CDP)1802 microprocessor, aka RCA COSMAC The COSMAC Elf an RCA COSMAC microprocessor–based computer released 1976, sold as a kit The COSMAC VIP an RCA COSMAC microprocessor–based computer aimed at video games, released 1977, sold as a kit
See also CosMc's, a spin-off of McDonald's