Martial Yao Kouassi (born 4 October 1989) is an Ivorian professional footballer who plays as a midfielder.
Born in Bingerville, Yao has played for ASEC Mimosas, Stade Tunisien, LPS Tozeur, US Ben Guerdane, Al-Merrikh, AS Gabès, Al-Adalah, Fujairah and Al-Bukiryah.
On 2 June 2018, he moved from Tunisian club AS Gabès to Saudi club Al-Adalah.
Yao played at the 2005 FIFA U-17 World Championship, and was compared to Claude Makélélé for his tireless midfield performances.