Apostolos Giannou (Greek: Απόστολος Γιάννου; born 25 January 1990) is a professional footballer who plays as a forward for Cypriot Second Division club Achyronas-Onisilos.

[4] Despite the unsuccessful trial, Giannou came back to Melbourne and signed a six-month contract with Victorian Premier League side Oakleigh Cannons.

[6][7] Down the track, Giannou was one of five Australians in the Greek side as the club welcomed the arrivals of Robert Stambolziev, Zeljko Kalac, Andreas Govas and Craig Moore.

After the relegation of Kavala, Zisis Vryzas had brought him to PAOK and Giannou was set free and on 30 September 2011 signed a three-year contract with P.A.O.K.

The 23-year-old striker was released by PAOK, as it was not in the plans of Huub Stevens, but did not stay for long time as unemployed and immediately signing a two-years' contract with the club.

On 29 November 2015, was anointed scorer with a second attempt after the successful repulse of the penalty from Roberto in overtime in a 3–1 away loss against Greek champions Olympiakos.

Asteras Tripolis have accepted a bid of €2.5 million for the Greek striker who is heading to China to undergo medical and complete his move.

[23] On 22 September 2020, Giannou after leaving AEK Larnaca, has decided to continue his career in Greece, signing a two-years deal with OFI Crete F.C., for an undisclosed fee.

[24] On 13 January 2022, Giannou after leaving OFI,[25] has decided to continue his career in Australia, signing a deal with Macarthur FC, for an undisclosed fee.

[27] Giannou's Indian Super League debut with the Blasters came on 7 October 2022 in a 3–1 win against East Bengal on the opening day of the 2022–23 season.

[33] Giannou was the only Victorian player selected for Australia's under-17 side that took part in the International Youth Football tournament in Niigata, Japan.

Under coach Alexis Alexiou, Giannou appeared twice at the European Under-19 Championships when he was substituted on in a 1–1 draw against Italy and started in a 3–0 loss against England as Greece finished at the bottom of their group.