Justin Mathieu (born 12 April 1996) is a Dutch professional footballer who plays as a attacking midfielder or winger for Bahraini Premier League club Al-Riffa.

In the summer of 2013, Willem II manager Jurgen Streppel selected ten players from the youth academy to be part of the first team in preparation for the new season.

On 23 August 2013, at the age of 17, he made his professional debut in a 3–0 home win against Sparta Rotterdam replacing Bruno Andrade in the 89th minute.

[8] Mathieu experienced a tumultuous time in Cambuur, serving three separate suspensions for the club in one year due to disciplinary issues.

[11] In July 2023, Mathieu left TOP Oss and signed a contract with Armenian Premier League club Noah.