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Farewell match and sporadic appearances

In February 2011, it was announced that Ronaldo would be given one last match for Brazil, a friendly against Romania in São Paulo on 7 June 2011, five years after his last match with the national team. Brazilian Football Confederation official Ricardo Teixeira stated that it was fitting that his final game should take place in Brazil while representing his nation.

Ronaldo played for 15 minutes in a match that ended with a Brazilian victory with a goal from Fred. Fred celebrated his goal with Ronaldo's famous 'finger wag' celebration along with his Brazilian teammates. Ronaldo was introduced after 30 minutes, partnering 19-year-old Neymar in attack, and had three shots on target which were saved by the Romanian goalkeeper Ciprian Tătărușanu. After the first half ended, Ronaldo made a farewell speech to the crowd. With 62 goals for Brazil Ronaldo retired from international football as the second-highest goalscorer for his country, behind only Pelé (Neymar has since surpassed Pelé, with Ronaldo the third-highest scorer as of September 2023).

On 13 December 2011 Ronaldo and Zinedine Zidane played a charity match with their friends against former and current players of the German team Hamburg in the ninth edition of the Match Against Poverty series, which Ronaldo and Zidane established in 2003. In December 2012, Ronaldo and Zidane reunited for the Match Against Poverty in Porto Alegre, Portugal, with the field littered with World Cup winners from France and Brazil, which also saw 1982 World Cup star Zico (Ronaldo's childhood idol) turn out for Ronaldo's team. In January 2013, Ronaldo was named one of the six ambassadors of the 2014 FIFA World Cup in Brazil.

Ronaldo was chosen as a goodwill ambassador for the United Nations Development Programme (UNDP) in 2000 as he had the highest global appeal among sportspeople, and he accepted the role as he saw it as "an obligation" to help with causes around the world. Ronaldo played in the UNDP's 11th Match Against Poverty on 4 March 2014 against a Zidane XI in Bern, Switzerland, with proceeds raised helping the recovery efforts in the Philippines in the wake of Typhoon Haiyan. Joined by Didier Drogba in attack, Ronaldo scored a hat-trick in the next year's match on 21 April 2015 in St Etienne, France, with proceeds going towards the African countries most affected by the Ebola epidemic.

On 14 June 2018, Ronaldo featured at the 2018 FIFA World Cup opening ceremony held at the Luzhniki Stadium in Moscow, Russia. He walked out with a child wearing a Russia 2018 shirt at the beginning, and returned at the end of the ceremony with the official ball of the 2018 World Cup – Adidas Telstar 18 – which was sent into space with the International Space Station crew in March and came back to Earth in early June.