| Post: | President Pro Tempore |
| Body: | Union of South American Nations |
| Insignia: | Emblem of the Union of South American Nations.svg |
| Insigniasize: | 100px |
| Incumbent: | Vacant |
| Nationality: | Bolivian |
| Incumbentsince: | 16 April 2019 |
| Termlength: | 1 year; states (alphabet) rotation |
| Formation: | 2008 |
| Inaugural: | Michelle Bachelet |
| Website: | unasursg.org |
The President Pro Tempore of the Union of South American Nations is the head position and representative of the Union of South American Nations (UNASUR). At international meetings, declarations and concerted opinions of the supranational organism are presented by the President Pro Tempore. The office is exercised for a one-year period on a pro tempore basis by one of the heads of state of each UNASUR Member State, the succession following alphabetical order.[1] The most recent president was the President of Bolivia, Evo Morales, who served, as acknowledged by unasursg.org, between 17 April 2018 and 16 April 2019.
The attributions of the President Pro Tempore are:
To organize, invite members, and preside over UNASUR meetings, present to the Council of Ministers of Foreign Affairs the annual plan of activities of UNASUR and the meetings agenda, in coordination with the Secretary General, represent UNASUR in international meetings, with the approval of the Member States and sign declarations and agreements with third parties, after approval from the pertaining UNASUR institutions.
The presidency pro tempore directs the eight ministerial councils of UNASUR: South American Council of Health, South American Council of Social Development, South American Council of Infrastructure and Planning, South American Council of Education, Culture, Science, Technology and Innovation; South American Council of Fight against the South American Narcotráfico, Council of Defense South American, South American Council of Economy and Finances, and South American Council.
| President pro tempore | width=70px | Portrait | width=100px | State | width=230px | National party | width=120px | Took office | width=120px | Left office | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Michelle Bachelet Verónica Michelle Bachelet Jeria |  Chile | Socialist Party of Chile | 23 May 2008 | 10 August 2009 | ||||||
| The first President of the Union of South American Nations and co-serving as the President of Chile. | |||||||||||
| 2 | Rafael Correa Rafael Vicente Correa Delgado |  Ecuador | PAIS Alliance | 10 August 2009 | 26 November 2010 | ||||||
| The second President of the Union of South American Nations and co-serving as the President of Ecuador. | |||||||||||
| 3 | Bharrat Jagdeo |  Guyana | People's Progressive Party | 26 November 2010 | 29 October 2011 | ||||||
| The third President of the Union of South American Nations and co-serving as the President of Guyana. | |||||||||||
| 4 | Fernando Lugo Fernando Armindo Lugo Méndez |  Paraguay | Guasú Front | 29 October 2011 | 22 June 2012 | ||||||
| The fourth President of the Union of South American Nations and co-serving as the President of Paraguay. Lugo resigned after being impeached as the President of Paraguay. | |||||||||||
| 5 | Ollanta Humala Ollanta Moisés Humala Tasso |  Peru | Peruvian Nationalist Party | 29 June 2012 | 30 August 2013 | ||||||
| The fifth President of the Union of South American Nations and co-serving as the President of Peru. | |||||||||||
| 6 | Dési Bouterse Desiré Delano Bouterse |  Suriname | National Democratic Party | 30 August 2013 | 4 December 2014 | ||||||
| The sixth President of the Union of South American Nations and co-serving as the President of Suriname. | |||||||||||
| 7 | José Mujica José Alberto "Pepe" Mujica Cordano |  Uruguay | Movement of Popular Participation | 4 December 2014 | 1 March 2015 | ||||||
| The seventh President of the Union of South American Nations and co-serving as the President of Uruguay. | |||||||||||
| 8 | Tabaré Vázquez Tabaré Ramón Vázquez Rosas | Uruguay | Socialist Party of Uruguay | 1 March 2015 | 17 April 2016 | ||||||
| The eighth President of the Union of South American Nations and co-serving as the President of Uruguay. | |||||||||||
| 9 | Nicolás Maduro Nicolás Maduro Moros | United Socialist Party of Venezuela | 17 April 2016 | 17 April 2017 | |||||||
| The ninth President of the Union of South American Nations and co-serving as the President of Venezuela. | |||||||||||
| 10 | Mauricio Macri |  Argentina | Republican Proposal | 17 April 2017 | 17 April 2018 | ||||||
| The tenth President of the Union of South American Nations and co-serving as the President of Argentina. | |||||||||||
| 11 | Evo Morales | Movement for Socialism | 17 April 2018 | 16 April 2019 | |||||||
| The eleventh President of the Union of South American Nations and co-serving as the President of Bolivia. | |||||||||||
 Brazil | |||||||||||
 Colombia | |||||||||||
| Chile | |||||||||||
| ---> | |||||||||||