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HRR may refer to:

  • Haploid-relative-risk, a method for determining gene allele association to a disease
  • Harrington railway station, in England
  • Henley Royal Regatta
  • Healy River Airport, in Alaska, United States
  • Heart rate reserve
  • Hirzebruch–Riemann–Roch theorem
  • Historicorum Romanorum reliquiae, a collection of ancient fragmentary Latin history-works
  • The History of Rock and Roll, a radio documentary
  • Holy Roman Empire (German: )
  • Hondo Railway, an American railway
  • Horuru language, spoken in Indonesia