• Railway Procurement Agency, a State Agency of the Department of Transport in the Republic of Ireland
• Representation of the People Act, a short title for legislation of the Parliament of the United Kingdom dealing with the electoral system
  • Representation of the People Act 1832 (AKA Reform Act 1832, an Act of Parliament (2 & 3 Will. IV) that introduced wide-ranging changes to the electoral system of England and Wales
  • Representation of the People (Ireland) Act 1832 (AKA Irish Reform Act 1832, an Act of Parliament that introduced wide-ranging changes to the election laws of Ireland
  • Representation of the People Act 1867 (AKA Reform Act 1867), a piece of British legislation that enfranchised the urban male working class in England and Wales
  • Representation of the People (Scotland) Act 1868, an Act of Parliament in the United Kingdom
  • Representation of the People (Ireland) Act 1868, an Act of Parliament in the United Kingdom
  • Representation of the People Act 1884, a law which further extended the suffrage in Britain after the Disraeli Government's Reform Act 1867
  • Representation of the People Act 1918, an Act of Parliament passed to reform the electoral system in the United Kingdom
  • Representation of the People (Equal Franchise) Act 1928, an Act of the Parliament of the United Kingdom
  • Representation of the People Act 1948, an Act of the Parliament of the United Kingdom that altered the law relating to parliamentary and local elections
  • Representation of the People Act 1949, an Act of the Parliament of the United Kingdom consolidating previous electoral law
  • Representation of the People Act 1969, an Act of the Parliament of the United Kingdom extending suffrage to 18-20 year olds
  • Representation of the People Act 1981, an Act of the Parliament of the United Kingdom changing the British electoral process
  • Representation of the People Act 1983, an Act of the Parliament of the United Kingdom changing the British electoral process
  • Representation of the People Act 1985, an Act of the Parliament of the United Kingdom concerning British electoral law
  • Representation of the People Act 1989, an act by the Parliament of the United Kingdom
  • Representation of the People Act 1990
  • Representation of the People Act 2000, an Act of the Parliament of the United Kingdom changing the British electoral process
• Republican Party of Arkansas, the affiliate of the Republican Party in Arkansas
• Republican Party of Armenia, a national conservative political party in Armenia
• Republican Party of Australia, a minor Australian political party dedicated to ending the country's links with the United Kingdom and establishing a republic
• Rural Payments Agency, an executive agency of the UK Department for Environment, Food and Rural Affairs
• Rwandan Patriotic Army, the national army of Rwanda preceding the Rwandan Defence Forces

• Religionspädagogische Akademie
• Rassenpolitisches Amt der NSDAP
• Röntgenprüfanlage (Flugsicherheit)
• Random Phase Approximation
• Railway Procurement Agency staatliche Eisenbahnbeschaffungsagentur Irlands
• Rechnungsprüfungsamt
• Rapid Plant Assessment
• Regional PROFIBUS & PROFINET Association

• Protéine de Réplication A,
• Réingénierie des processus d'affaires,

• Le rayonnement photosynthétiquement actif (RPA ou PAR, de l'anglais photosynthetically active radiation) est l'énergie lumineuse utilisée pour la photosynthèse des plantes.

Jego początki to dwie burskie republiki: Transwal i Orania. Burowie byli potomkami osadników holenderskich przybyłych tu w XVII wieku. Pod koniec XIX wieku wybuchły dwie wojny burskie z Wielką Brytanią. Do roku 1994 w RPA obowiązywał rasistowski system społeczny (apartheid). Postacią symbolizującą walkę z państwem prześladującym czarnych obywateli był Nelson Mandela. Za swój wkład w demokratyczne przemiany Mandela otrzymał w roku 1993 pokojową Nagrodę Nobla. Jednak od czasu przejęcia władzy przez czarnych, gwałtownie pogorszyła się sytuacja gospodarcza i wewnętrzna kraju, a dyskryminowani bywają teraz jego biali mieszkańcy. Mimo to, RPA pozostaje najbogatszym państwem na kontynencie.

• RPA - codice aeroportuale IATA dell'aeroporto civile di Rolpa (Nepal)