Hannu (from Hannes, a diminutive of Johannes) is a Finnish first name. Notable people with the name include:
Hannu Aravirta (born 1953), Finnish ice hockey playerHannu Kaislama (born 1956), Finnish boxerHannu Kamppuri (born 1957), former professional ice hockey goaltenderHannu Kapanen (born 1951), former Finnish ice hockey playerHannu Manninen (born 1978), Finnish Nordic combined athleteHannu Mikkola (born 1942), retired world champion rally driverHannu Patronen (born 1984), Finnish footballerHannu Rajaniemi (born 1978), Finnish sci-fi authorHannu Salama (born 1936), Finnish authorHannu Siitonen (born 1949), Finnish athleteHannu Taipale (born 1940), former Finnish cross country skierHannu Takkula (born 1963), Finnish politicianHannu Tihinen (born 1976), Finnish footballerHannu Toivonen (born 1984), Finnish ice hockey goaltenderHannu Touru (born 1952), experienced football managerHannu Virta (born 1963), retired Finnish professional ice hockey defencemanHannu Vitanen, fictional Finnish character from the webcomic A Redtail's dream.