CFL commissioner Mark Cohon made the announcement at the Pinnacle Club at Investors Group Field, calling it "The worst-kept secret that has been in the province for a while and I think across this country. So here we go," he said.
"I'm proud to announce that the 103rd Grey Cup, in 2015, has been awarded to the Winnipeg Blue Bombers, the city of Winnipeg, and the proud people of Manitoba. Congratulations"
Cohon said the Bombers' new home is the perfect place for the event.
"I'm obviously very proud about this announcement today, because this gives a great opportunity to showcase the modern CFL in our premiere event, in a beautiful, modern Investors Group Field."
The championship game will be held Nov. 29, 2015.
Bomber CEO Wade Miller expects the team will make profits of between $3 and $4 million.
It's the fourth time Winnipeg has hosted the cup. The event was held in 1991, 1998, and most recently 2006.
The Bombers have never played in any of the Grey Cup games hosted in Winnipeg.