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