Adachi (written: 安達, 足達, 足立 or あだち in hiragana) is a Japanese surname. Notable people with the surname include:
Adachi clan, a family of samuraiAdachi Morinaga (1135–1200), Japanese warrior from the Adachi clanAdachi Kagemori (died 1248), Japanese warrior from the Adachi clan and was a son of MorinagaAkihiko Adachi (born 1965), a Japanese mixed martial artistHatazō Adachi (1884–1947), Japanese GeneralJeff Adachi (born 1959), Public Defender of San FranciscoKatsuji Adachi, (better known as Mr. Hito) retired Japanese professional wrestlerAdachi Kenzō (1864-1948), Japanese politician and pre-war cabinet ministerMasao Adachi (born 1939), Japanese screenwriter and directorMitsuru Adachi, Japanese manga artistOsamu Adachi (born 1987), Japanese actor and singerShōtarō Adachi (1901-1995), Japanese photographerTsutomu Adachi (1947–2004), Japanese manga artist and the older brother of Mitsuru AdachiYuji Adachi, male Japanese popular music guitaristYumi Adachi, Japanese actressMineichirō Adachi (1870–1934), Japanese judgeFictional characters:
Adachi Tohru, a character from Persona 4Adachi Hana, a character from Flunk Punk Rumble