HCN

HCN may refer to:

Science and mathematics

 * HCN channel, a cellular ion channel
 * Highly composite number, a type of integer
 * Hydrogen cyanide, The toxic gas

Transportation

 * Halcyonair, a Cape Verdean airline
 * Headcorn railway station, in England
 * Hengchun Airport, in Taiwan

Other

 * Health Communication Network, an Australian software company
 * High Country News, an American newspaper