Championship is a term used in sport to refer to various forms of competition in which the aim is to decide which individual or team is the champion.

Various forms of competition can be referred to by the term championship.

In this system, a competitor has to challenge the current champion to win the championship. This form of championship is used in wrestling, boxing, and other combat sports.

The term championships (in the plural) is often used to refer to tournament competitions, either using a knockout format, such as at Wimbledon and other championships in tennis, or a mixed format with a group stage followed by knockout rounds, such as used in the European Football Championships.

A variation of the knockout format is the "best-of-X" or series format where two teams face other for a specified number of times until one team wins the majority of specified games, most of the time the remaining games are not played anymore; only then is the losing team eliminated from contention and the winning team advances to the next level. This format is predominant in American sports such as baseball, ice hockey and basketball, and on test cricket.