Antoine Colassin (born 26 February 2001) is a Belgian professional footballer who plays as a striker for Belgian Pro League club Charleroi.
On 30 August 2022, Colassin joined Heerenveen in the Netherlands on a season-long loan with an option to buy.
On 30 August 2024, Colassin moved to Beerschot.
On 8 July 2025, Colassin signed a three-year contract with Charleroi.