RDF is a three-letter abbreviation that may refer to:

In entertainment:

• Reality distortion field, a facetious term for the ability of certain charismatic people to convince others to believe almost anything
• Robotech Defense Force, or Robotech Armed Forces, a military faction in the fictional "Robotech" universe
• Radical Dance Faction, a band from the United Kingdom

In military:

• Rapid deployment force(s):
  • Finnish Rapid Deployment Force, Finland
  • Rapid Deployment Forces, United States
• Reserve Defence Forces, Ireland

In organizations:

• Richard Dawkins Foundation for Reason and Science, a non-profit organization
• RDF Media, a television production company
• RDF Group plc, an IT services provider (Recruitment, Managed Services, Products, Learning Services). (No connection with RDF Media)

In technology:

• Resource Description Framework, a World Wide Web Consortium specification for a metadata model and component in the proposed Semantic Web
• Radial distribution function, the probability of finding an atom at a certain distance away from another atom
• Radio direction finder
• Random dopant fluctuation
• Reuters Data Feed
• Refuse derived fuel

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