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