Mercedes Isabel Pérez Tigreros (born August 7, 1987) is a female Colombian weightlifter competing in the 63 kg category until 2018 and 64 kg starting in 2018 after the International Weightlifting Federation reorganized the categories.

[1] She competed at the 2008 Summer Olympics in Beijing competing in the 63 kg division.

Originally she finished ninth but the original silver medalist Irina Nekrassova failed a doping control and her results were disqualified,[2] as a result, Mercedes got moved up to eight place.

In 2016 she competed at the 2016 Summer Olympics in the 63 kg division finishing fourth overall.

In 2021 she competed at the 2020 Summer Olympics In the 64 kg.