HC

HC, hc or H/C may refer to:

Science, technology, and mathematics

Medicine

• Health Canada
• Hemicrania continua
• Hyperelastosis cutis or hereditary equine regional dermal asthenia

Chemistry

• Hemocyanin, a metalloprotein abbreviated Hc
• HC smoke, a US military designation for Hexachloroethane
• Homocapsaicin, a capsaicinoid
• Hydrocarbon, a category of substances consisting only of hydrogen and carbo

Computer Science

• H-C - Human-Computer, also H/C - Human/Computer, as in HCI - Human-Computer Interface, Human-Computer Interface

Other uses in science, technology, and mathematics

• Felix HC, a series of Romanian personal microcomputers produced by ICE Felix Bucharest and which were ZX Spectrum clones
• Hemianthus callitrichoides, a freshwater aquatic plant native to Cuba
• + h.c., a notation used in mathematics and quantum physics

Sports

• Hors catégorie (French), used in cycle races to designate a climb that is "beyond categorization"
• UCI .HC road cycling races (1.HC and 2.HC), the second tier of events in the sport, after the UCI World Tour

Other uses

• Heritage Corridor, a Metra commuter rail line running from Chicago to Joliet, Illinois
• Highway contract route, an outsourced United States Postal Service delivery method, formerly known as Star routes
• Honorary degree, or honoris causa
• Hors de commerce, prints similar to Artist Proofs except they are only available through the artist directly
• Hospitality Club, an internet-based hospitality service
• Aero-Tropics Air Services (IATA airline designator HC)