Hannachi (also spelled Hanachi) is a surname common in Tunisia and Algeria. Originally designating the members of a Amazigh semi-independent tribe, the Hanencha, whose territory was located in Eastern Algeria and Western Tunisia. Notable people with the surname include:
Maher Hannachi (born 1984), Tunisian footballer Mohand Chérif Hannachi (1950–2020), Algerian footballer Raouf Hannachi, Canadian muezzin