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The initials RPN may refer to:

  • Registered Practical Nurse, also referred to as a licensed practical nurse
  • Radio Philippines Network, Channel 9, Philippines
  • Registered Parameter Number, as used in Musical Instrument Digital Interface synthesizers
  • Registered Psychiatric Nurse
  • Reverse Polish notation, a.k.a. Postfix notation, a mathematical notation
  • Risk Priority Number, as used in failure mode and effects analysis
  • Recherche en Prévision Numérique, a numerical weather prediction research center in Canada

RPN may also refer to:

  • RPN, the IATA airport code for Rosh Pina Airport, Israel
  • RP, Real projective space, in mathematics