Martin Dubreuil (born May 26, 1972) is a Canadian actor and musician from Quebec. He is most noted for his performance in the film For Those Who Don't Read Me (À tous ceux qui ne me lisent pas), for which he won the Prix Iris for Best Actor at the 21st Quebec Cinema Awards in 2019.
He has been a two-time Genie Award and Canadian Screen Award nominee, receiving nods for Best Supporting Actor at the 31st Genie Awards for 10½ and Best Actor at the 7th Canadian Screen Awards in 2019 for The Great Darkened Days (La grande noirceur), and a three-time Jutra/Iris nominee for Best Supporting Actor, with nods at the 13th Jutra Awards in 2011 for 7 Days (Les 7 Jours du Talion), the 19th Quebec Cinema Awards in 2017 for Shambles (Maudite poutine), and the 24th Quebec Cinema Awards in 2022 for Maria Chapdelaine.
As a musician he was a member of the band Les Breastfeeders, in which he used the stage name "Johnny Maldoror".