Ali Eren Demirezen (born 2 April 1990) is a Turkish professional boxer who held the WBO European heavyweight title from 2018 to 2019.

As an amateur he won a silver medal at the 2013 Mediterranean Games in Mersin, Turkey.

[3] At the 2013 AIBA World Boxing Championships in Almaty, Kazakhstan, he was eliminated already in the first round.

He was eliminated in the quarterfinals, however, was qualified to participate at the AIBA World Boxing Championships the same year.

[5] He was defeated by Joe Joyce from England in the Section 2 quarterfinals of the 2015 AIBA World Boxing Championships in Doha, Qatar.