CNO

CNO may refer to:
 * C/N0, the carrier-to-noise-density ratio of a signal
 * Casualty notification officer, a person responsible for informing relatives of death or injury
 * Chief networking officer, a business role
 * Chief nursing officer, a nursing management position
 * Chief of Naval Operations, the head of the United States Navy
 * Chino Airport, in California, IATA symbol: CNO
 * Chronic nuisance ordinance, a law that aims to evict tenants for reporting crime
 * CNO cycle, a stellar nuclear fusion reaction
 * Coconut oil, an edible oil
 * Computer network operations, the optimization and use of digital telecommunications
 * CNO Financial Group, an American financial services holding company
 * CNO (gene), which encodes the protein cappuccino homolog
 * Clozapine N-oxide, a synthetic ligand which activates a receptor
 * Fulminate, a chemical compound containing the CNO- ion