RRA is the abbreviation for:

  • Stormwater retention system
  • Rahanweyn Resistance Army, a Somali civil war faction in Südwestsomalia
  • Round robin archives, a data storage method of RRDtool
  • Relative risk aversion by Arrow and Pratt, a measure of the risk aversion of a decision

RRa is the abbreviation for:

  • Right to travel date, a German journal in the field of travel law
  • Disambiguation
  • Abbreviation