RDN

RDN may refer to:


 * Radian Group (NYSE stock symbol), an American mortgage insurance company
 * Radiodialnet (RDN.pe), communications and psychology department radio station for the University of San Martín de Porres
 * Redang Airport (IATA airport code), Malaysia
 * Reddish North railway station (National Rail station code), England
 * Regional District of Nanaimo, on Vancouver Island, British Columbia, Canada
 * Registered Dental Nurse
 * Registered Dietitian Nutritionist, a qualified dietician
 * Relative Distinguished Name, an identifier type in the LDAP internet protocol
 * Robert De Niro
 * Royal Danish Navy