2018 Manitoba Junior B Hockey Playoffs

This is the 2018 Manitoba Junior B Hockey Championship. The Keystone Junior Hockey League is the only league in the province at the Junior B level and their playoff finalists advanced to the 2018 Keystone Cup, along with the finalists of the Lakehead Junior Hockey League playoffs. Previously, only the playoff champions advanced. The format was changed due to British Columbia, Alberta, and Saskatchewan not sending representatives to the tournament.

Quarterfinals

 * Selkirk Fishermen defeated Cross Lake Islanders 3 games to none
 * Peguis Juniors defeated North Winnipeg Satelites 3 games to none
 * St. Malo Warriors defeated OCN Storm 3 games to 1
 * Lundar Falcons defeated Arborg Ice Dawgs 3 games to 2

Semifinals

 * St. Malo Warriors defeated Selkirk Fishermen 4 games to 3
 * Peguis Juniors defeated Lundar Falcons 4 games to none

Final

 * Peguis Juniors defeated St. Malo Warriors 4 games to 1