Mariana dos Santos Silva (born February 22, 1990) is a judoka from Brazil who competes in the women's half-middleweight (-63kg). She won a bronze at the 2015 Pan American Games. That year, she also won gold at the World Military Games. In 2016, she won the Pan American Judo Championships, having won silver in 2011 and 2015, and bronze medals in 2010 and 2012. Previously, she won a bronze medal in the 2009 World Junior Championships. She has appeared at two Olympics for Brazil (2012 and 2016).