The fire broke out around 4 a.m. in an apartment at 3858 des Thuyas Street.
A neighbour interviewed by Radio-Canada said he tried to enter the apartment to help get the tenant out, but the fire was too intense.
"There was a lot of smoke and I tried to push the door, then I saw the fire. I stopped pushing because I was afraid that opening the door would result in suction," said Yannick Gariépy.
Around 20 people escaped the flames without injuries and four apartments suffered heavy damage.
Officials are investigating the cause of the fire.