The Swingin' A's is a nickname for the Oakland Athletics (A's) Major League Baseball team, primarily used in reference to the A's team of the 1970s that dominated the American League from 1971 to 1975, won three consecutive World Series championships in 1972, 1973 and 1974, and is widely recognized as being among the best in baseball history. The team won five consecutive American League West Division titles and three American League pennants en route to their three World Series titles. They were the first team to win three consecutive World Series championships in two decades; no team other than the New York Yankees have completed a three-peat, and no team repeated as champion three times until the Yankees in 2000.

The Oakland Athletics are an American professional baseball team based in Oakland, California. The Athletics compete in Major League Baseball (MLB) as a member club of the American League (AL) West Division. The team currently plays its home games at the Oakland Coliseum, with plans to temporarily move to Sutter Health Park in West Sacramento, California, for the 2025–2027 seasons, prior to their permanent move to Las Vegas. The nine World Series championships, fifteen pennants, and seventeen division titles that the A's have won throughout their history is the second-highest in the American League after the New York Yankees.