Sergio Ezequiel Unrein (born 16 June 1991) is an Argentine footballer who plays as a striker for Atlántico FC in the Dominican Republic.
In January 2018, Unrein went on trial with Kazakhstan Premier League club Irtysh Pavlodar.
In the same month, he was signed by Pahang FA of Malaysia Super League, but he was released in February after only playing 1 league game with them and replaced by Francis Forkey Doe.