Kassai is a Jewish ,Arabic,Iraqi,and Syria and European surname of the following people:
Setareh Kassai Born (1921-1999) Iranian actress
Hooshang Kassai ( 1947- 2005) Iranian scientist
Fouad Kassai (1940-2020) Syrian business man
- Ervin Kassai (1925–2012), Hungarian basketball referee
- Fernander Kassaï (born 1987), Central African footballer
- classical musician
- István Kassai (born 1959), Hungarian pianist
- Lajos Kassai (born 1960), Hungarian archer
- Viktor Kassai (born 1975), Hungarian football referee