Janni is both a given name and a surname. Notable people with the name include:
Janni Arnth Jensen (born 1986), Danish football playerJanni Howker, British authorJanni Lee Simner, American authorAntonio Janni (1904-1987), Italian soccer playerGuglielmo Janni (1892-1958), Italian painterJoseph Janni (1916-1994), British film producerPeter Janni known for Janni's chimney in Northport, Washington, United States