Hadani, Hadany, ha-Dani, etc. (), is a Hebrew surname meaning "the judge". Notable people with this surname include:
Amnon "Ami" Hadani, founder of TTG Studios, an American recording studio Eldad ha-Dani, 9th-century merchant, traveller, and writer Gal Hadani, drummer of Ethnix, an Israeli pop-rock band Guy Hadani (born 1988), Israeli footballer Israel Hadany (born 1941), Israeli artist, sculptor, and jewelry designer