In sports (especially in North America), a three-peat is winning three consecutive championships or tournaments. The term, a portmanteau of the words three and repeat, originated with the Los Angeles Lakers of the National Basketball Association, during their unsuccessful campaign for a third consecutive championship during the 1988–89 season, having won the previous 2 NBA Finals. The Lakers, however, were swept by the Detroit Pistons in the 1989 NBA Finals. The term is a registered trademark owned by Pat Riley, the Lakers' head coach from 1981–1990, although it was coined by L.A. player Byron Scott immediately after their successful championship defense against the Pistons in the 1988 NBA Finals. The Lakers finally achieved a three-peat over a decade later, winning the NBA title in 2000, 2001, and 2002. It was their second in franchise history, and only the first since moving from Minneapolis. As of 2022, the Lakers are the last team of the 4 major American professional sports (NHL, MLB, NFL, & NBA) to accomplish the three-peat.

While originating in the United States, the three-peat has been replicated all over the world across different sports. In recent times, Spanish association football club Real Madrid notably became the first club of the modern era to win three consecutive UEFA Champions League titles (2015–16, 2016–17 and 2017–18).