ODN

ODN may refer to:
 * Optical Distribution Network, the physical fibre and optical devices that distribute signals to users in a telecommunications network.
 * Ordnance Datum Newlyn, the mean sea-level height datum in Great Britain.
 * CpG Oligodeoxynucleotide also known as a CpG ODN, a molecule with immunostimulatory properties.
 * Open DOS Navigator, an orthodox file manager for DOS
 * Orbital Data Network, a public safety satellite network.