QCS may refer to:
Queen's Colour Squadron, a unit of the British Royal Air Force Queensland Core Skills Test, a former year-12 standardised test in Queensland, Australia Queensland Corrective Services, a Queensland Government department, Australia quick connection system, a system of quick connect fittings quality control system, a system for quality control
See also
Queen Charlotte Sound (disambiguation) WQCS, station QCS in region W QC (disambiguation) for the singular of QCs