Miguel Ángel Saiz (May 17, 1949 – October 22, 2019) was an Uruguay-born Argentine politician latterly of the Radical Civic Union (UCR), who served as governor of Río Negro Province between 2003 and 2011.

President Kirchner considered backing Saiz at the expense of his own party, though ultimately opted to play no role in the provincial election.

During his tenure in office he banned the use, storage and trasport of mercury and cyanide in Río Negro,[3] allowed fracking,[4] incentivized science and the development and technology through state-owned INVAP,[5][6] eliminated slums by building new affordable housing,[7] and invested on the Tren Patagónico rail line.

In the 2013 legislative elections, Saiz became the UCR's senatorial candidate for Río Negro after defeating Horacio Massaccesi and Fernando Chironi in the primaries.

[9] Saiz died of cardiovascular disease on 22 October 2019, aged 70, in Buenos Aires, where he had traveled to watch a football match between Boca Juniors and River Plate and attend political meetings.