Kosta Petratos (born 1 March 1998) is an Australian professional soccer player who plays as a forward for Olympias Lympion.
Petratos started his youth career at the Football New South Wales National Training Centre. In 2014 he joined the FFA Centre of Excellence talent identification and player development program in Canberra, coached by Tony Vidmar, before he was signed by Perth Glory for the 2016–17 A-League season. He made 9 senior cap appearances for the Glory. Petratos signed for the Newcastle Jets for the 2017–18 A-League season to gain more game time opportunities. In 2022, Petratos departed the Jets and joined second division football club Olympias Lympion, in Cyprus.