Alma is near Saguenay, Que., about five hours northeast of Montreal.
Two snowmobiles collided just before 2 a.m. on the St. George River.
There were two men riding on each snowmobile. All four men were in their 20s; the man who died was 24 years old.
Quebec's provincial police said the three surviving men were seriously injured.
Police also said the riders weren’t wearing helmets.
Police are investigating to find more information about why the crash happened. They suspect alcohol and possibly drugs may have been involved.