Veinticinco de Mayo () is Argentina's national day, and may refer to: The day during the May Revolution when the Primera Junta (first autonomous government in Argentina) was instituted Geographic locations in Argentina Veinticinco de Mayo Partido, partido in Buenos Aires Province, Argentina Veinticinco de Mayo, Buenos Aires, city in Buenos Aires Province, Argentina Veinticinco de Mayo Department, Chaco, Chaco Province, Argentina Veinticinco de Mayo (Misiones), Misiones Province, Argentina Veinticinco de Mayo Department, Misiones, Misiones Province, Argentina Veinticinco de Mayo Department, Río Negro, Río Negro Province, Argentina Veinticinco de Mayo, La Pampa, La Pampa Province, Argentina Veinticinco de Mayo, Uruguay, Florida Department, Uruguay Ships of the Argentine Navy Veinticinco de Mayo (1810), a brigantine launched in 1810 which served during the Independence War ARA Veinticinco de Mayo (C-2), a cruiser which served Argentina during World War II ARA Veinticinco de Mayo (V-2), an aircraft carrier which served Argentina up to 1990 See also ARA Veinticinco de Mayo (disambiguation), a list of the Argentine Navy ships with this name