Antoniu is a given name and a surname. Notable people with this name include the following:
Given name Antoniu Buci (born 1990), Romanian weightlifter Antoniu Vasile (born 1942), Romanian boxer
Surname Costache Antoniu (1900–1979), Romanian actor Kristaq Antoniu, also known as Cristache Antoniu, (1907 – 1979), Romanian singer and actor
See also
Antoni Antonia Antonic Antonie Antonik Antonin Antonio Antonis Antonius