Mariana Alejandra Pion Núñez (born 19 December 1992) is a Uruguayan professional footballer who plays as a midfielder for Paraguayan Women's Championship club Libertad/Limpeño and the Uruguay women's national team.
Pion played in Uruguay for Nacional, Colón and River Plate.
Pion represented Uruguay at the 2012 South American U-20 Women's Championship. At senior level, she played two Copa América Femenina editions (2010 and 2014).
Scores and results list Uruguay's goal tally first