Guarnieri is an Italian surname. Notable people with the surname include:
Adriano Guarnieri (1914–1983), Italian alpine skierAdriano Guarnieri (composer) (born 1947), Italian classical composerAlbert Guarnieri (1899–1980), American football playerAlbina Guarnieri (born 1953), Italian-born Canadian politicianAnna Maria Guarnieri (born 1933), Italian actressAntonio Guarnieri (1880–1952), Italian classical cellist and conductorCamargo Guarnieri (1907–1993), Brazilian composerEnnio Guarnieri (born 1930), Italian cinematographerGianfrancesco Guarnieri (1934–2006), Brazilian actor, lyricist, poet and playwrightGiuseppe Guarnieri (1856–1918), Italian physicianJacopo Guarnieri (born 1987), Italian cyclistJohnny Guarnieri (1917–1985), American musicianLuiz Carlos Guarnieri (born 1971), Brazilian footballerUmberto Guarnieri (born 1919), Italian footballer