A playoff beard is the superstitious practice of male athletes not shaving their beards during playoffs. Playoff beards were introduced by ice hockey players participating in the Stanley Cup playoffs, and are now a tradition in many sports leagues. Many fans of professional sports teams also grow playoff beards. The player stops shaving when his team enters the playoffs and does not shave until his team is eliminated or wins the Stanley Cup.

The Stanley Cup playoffs is the annual elimination tournament to determine the winner of the Stanley Cup, and by default the league champion of the National Hockey League (NHL). The four-round, best-of-seven tournament is held after the NHL's regular season. Eight teams from each of the league's two conferences qualify for the playoffs based on regular season points totals. The final round is commonly known as the Stanley Cup Finals, which matches the two conference champions.