Kouassi is a surname. Notable people with the surname include:
Blaise Kouassi (footballer, born 1974), former Côte d'Ivoire football defender Blaise Kouassi (footballer, born 1983), Ivorian footballer Desmond N'Ze Kouassi (or Desmond N'Ze) (born 1989), Ghanaian footballer Euphrasie Kouassi Yao (born 1964), Ivorian politician Gervais Lombe Yao Kouassi known as Gervinho (born 1987), Ivorian footballer Jean Evrard Kouassi (born 1994), Ivorian footballer Marcus N'Ze Kouassi known as Marcus N'Ze (born 1987), Ghanaian footballer Martial Yao Kouassi (or Martial Yao) (born 1989), Ivorian footballer Venceslas Kouassi (born 1981), Ivorian-born Burkinabé footballer Victor Kouassi (born 1971), Ivorian rugby union player Xavier Kouassi (born 1989), Ivorian-Swiss footballer Owen Kouassi (born 2003), Ivorian footballer Arsène Kouassi (born 2004), Ivorian-Burkinabé footballer