Janowicz ( [jaˈnɔvit͡ʂ]) is a Polish language surname. Notable bearers include:
Jerzy Janowicz (born 1990), Polish professional tennis playerMikolaj Janowicz Kiezgajlo, Lithuanian: Mykolas Kęsgaila Valimantaitis (died c. 1450), Lithuanian nobleman from DeltuvaRyszard Pędrak-Janowicz (1932, Lwów – 2004, Kraków), Polish lugerStanislaw Janowicz Kiezgajlo (died 1526), Lithuanian noblemanVictor Felix "Vic" Janowicz (1930–1996), American football halfback