The 1989 Stanley Cup playoffs, the playoff tournament of the National Hockey League (NHL) began on April 5, after the conclusion of the 1988–89 NHL season. This was the final year that all of the Division Semifinals began with teams playing the first four games in a span of five days. The playoffs concluded on May 25 with the champion Calgary Flames defeating the Montreal Canadiens 4–2 to win the Stanley Cup Finals four games to two.