Hadad was the storm and rain god in the Northwest Semitic and ancient Mesopotamian religions.
Hadad or Haddad may also refer to:
- Haddad or Hadad, an ancient Middle Eastern family name originating in Aramaic
- Hadad (Bible), the name of several biblical characters
- Hadad (son of Bedad), an early king of Edom
- Hadad the Edomite
- Hodod (Hungarian: Hadad), a commune in Romania