NICS is a four-letter abbreviation with multiple meanings, such as:

Network of International Christian Schools, a small association operating schools in various countries National Instant Criminal Background Check System in the United States Non-invasive cerebellar stimulation Northern Ireland Civil Service Northern Ireland Civil Service F.C., a football club Nucleus-independent chemical shift National Insurance Contributions (NICs) in the United Kingdom National Institute for Computational Sciences, a supercomputing center managed by the University of Tennessee

See also NIC (disambiguation)