Stephanie Mariel Petit (born 25 August 1996) is an Argentine former tennis player. Petit has a career-high a singles ranking by the Women's Tennis Association (WTA) of 525, achieved on 12 February 2018. She also has a career-high WTA doubles ranking of 559, achieved on 26 February 2018. She won four ITF doubles titles. Petit made her Fed Cup debut for Argentina in 2018.