The Pittsburgh Pirates are a Major League Baseball club based in Pittsburgh, Pennsylvania. They play in the Central Division of the National League, and are five-time World Series champions. The Pirates are also often referred to as the "Bucs" or sometimes the "Buccos" (derived from buccaneer, a synonym for pirate).

The franchise joined the National League in its sixth season in 1887 and was competitive from its early years, winning three National League titles from 1901 to 1903, playing in the very first World Series in 1903 and winning their first World Series in 1909 behind Honus Wagner. The Pirates have had many ups and downs during their long history, most famously winning the 1960 World Series on a walk-off home run by Bill Mazeroski, the only time that Game 7 of the World Series has ever ended with a home run. They also won the 1971 World Series behind Roberto Clemente and the 1979 World Series under the slogan "We Are Family", led by "Pops" Willie Stargell.