Sandro Fabio Mareco (born 13 May 1987) is an Argentine chess player. He was awarded the title of Grandmaster by FIDE in 2010. Mareco competed in the FIDE World Cup in 2011 (losing to Ferenc Berkes in the first round), 2013 (losing to David Navara in the first round), 2015 (beating Ni Hua in the first round and losing to Anton Kovalyov in the second round), 2017 (losing to Matthias Blübaum in the first round), 2019 (losing to Sanan Sjugirov in the first round) and 2021 (defeating Sami Khader in the first round). He has played for the Argentine national team in the Chess Olympiad since 2012.