Yianni Nicolaou (born 5 January 2000) is an Australian professional soccer player who plays as a defender for Sutherland Sharks.
Born in Australia of Greek descent, Nicolaou was a youth product of Marconi during which he trialed in Scotland and England after his breakthrough to the first-team in 2018. He joined Salford City in August 2019, after a successful trial that led him to sign a one-year contract with an option to extend. Nicolaou eventually returned to Australia after two loan spells with Buxton and Runcorn Linnets.
He signed for a season with Northbridge Bulls, the reserve side of Macarthur FC, on 20 November 2020, before transferring to APIA Leichhardt where he helped his side win the 2023 National Premier Leagues NSW premiership in his second season.
Nicolaou re-signed for Macarthur FC on 12 September 2023, returning to the first team after spending two seasons in state league football. On 31 January 2024, Nicolaou extended his contract for one year with the Bulls.