Giannopoulos, Yannopoulos, Yiannopoulos, Gianopoulos or Gianopulos, variously transliterated from the Greek: Γιαννόπουλος, is a Greek family name, which means "son of John".
The female version of the name is Giannopoulou/Yiannopoulou (Γιαννοπούλου).
Notable people with this name include: