Dimitris Koukoulopoulos (born 1984) is a Greek mathematician working in analytic number theory as a professor at the University of Montreal.
In 2019, in joint work with James Maynard, he proved the Duffin-Schaeffer conjecture.
He was an invited speaker at the 2022 International Congress of Mathematicians.
He was the 2022 recipient of the Ribenboim Prize of the Canadian Number Theory Association.