List of NHL franchise post-season appearance streaks

These are lists of active and all-time National Hockey League (NHL) franchise post-season appearance, post-season series win, Stanley Cup Final and Stanley Cup streaks up to and including the 2017–18 NHL season and subsequent 2018 Stanley Cup playoffs. These lists do not include the canceled 2004–05 NHL season.
Longest active streaks.
Post-season appearance streaks.
A post-season appearance streak is continued by making the NHL playoffs in consecutive years after the regular season. Since the first round of the playoffs consists of 8 series, there will always be 16 teams in this list (of the 31 teams in the NHL). 
Post-season series win streaks.
This is a list of teams that have active post-season series win streaks. A post-season series win streak is continued by making the post-season and winning at least the first round series of the playoffs. Since the first round of the playoffs consists of 16 teams in 8 series, there will always be 8 teams in this list, the winners of those series.
Longest all-time streaks.
Post-season appearance streaks.
This section has been updated to include teams who appeared in the 2017 Stanley Cup playoffs.
Post-season series win streaks.
Consecutive seasons with at least one series victory.