RDG, or Rdg, may refer to:
Rail Delivery Group, a body in the privatised British railway system
RDG Red Data Girl, fantasy novel series by Noriko Ogiwara
RDG, the AAR reporting mark for the Reading Company, a defunct US railroad
RDG, the IATA code for Reading Regional Airport in the state of Pennsylvania, US
RDG, the National Rail code for Reading railway station in the county of Berkshire, UK
Reading, in the field of temperature measurement
Rechtsdienstleistungsgesetz, the German Legal Services Act
Revolutionary Democratic Group, socialist organisation in the United Kingdom
Royal Dragoon Guards, the Royal Dragoon Guards is an armoured regiment of the British Army
Rwanda Development Gateway, a project to set up a national Rwandan portal for information sharing