Oleksandr Serhiyovych Melnyk (; born 10 February 2000) is a Ukrainian professional footballer who plays as a centre-back.
Born in Kyiv, Melnyk is a product of his native Dynamo Kyiv academy. His first coaches were Yuriy Yeskin and Valeriy Shabelnikov.
He signed a contract with Ukrainian Premier League club Oleksandriya in July 2019 made his debut in the Ukrainian Premier League for Oleksandriya on 16 July 2020, playing as a start squad player in the winning away match against Desna Chernihiv.