The term wild card refers broadly to a tournament or playoff berth awarded to an individual or team that has not qualified through normal play.

In North American professional sports leagues, wild card refers to a team that qualifies for the championship playoffs without winning their specific subdivision (usually called a conference or division) outright. The number of wild card teams varies. In most cases, the rules of the league call for the wild card team to survive an extra round and/or to play the majority of their postseason games away from home.

The term should not be confused with playoff formats that call for a set number of teams to qualify per division. The American Football League's 1969 playoffs (qualifying the top two finishers from each division), the National Basketball Association's 1967-1970 playoffs (qualifying the top four finishers from each division) and 1970-1972 playoffs (qualifying the top two finishers in each division), and the National Hockey League's 1968-1974 and 1982-1993 playoffs (qualifying the top four finishers from each division) should not be confused with wild-card playoff formats. When a wild-card playoff format is used, the number of teams that may qualify per division is not fixed; the divisional champion will usually qualify automatically, but non-division finishers qualify based on record either in the league overall or within a conference.