The 1977–78 NHL season was the 61st season of the National Hockey League. The Montreal Canadiens won their third Stanley Cup in a row, defeating the Boston Bruins four games to two in the Stanley Cup Finals.

The Montreal Canadiens, officially le Club de hockey Canadien and colloquially known as the Habs, are a professional ice hockey team based in Montreal. The Canadiens compete in the National Hockey League (NHL) as a member of the Atlantic Division of the Eastern Conference. Since 1996, the team has played its home games at Bell Centre, originally known as Molson Centre. The Canadiens previously played at the Montreal Forum, which housed the team for seven decades and all but their first two Stanley Cup championships.