Ouadah is a surname. Notable people with the surname include:
Abdelali Ouadah (born 1988), French footballer Abdelnasser Ouadah (born 1975), French-born Algerian footballer El Hadi Fayçal Ouadah (born 1983), Algerian footballer Isma Ouadah (born 1983), Algerian footballer Mohamed Ouadah (born 1994), French footballer