The 1900 Boston Beaneaters season was the 30th season of the franchise.

Frank Gibson Selee was an American Major League Baseball manager in the National League (NL). In his 16-year Major League career, he managed the Boston Beaneaters (1890–1901) and Chicago Orphans / Cubs (1902–1905), winning 1,284 games. Selee managed the Beaneaters during their 1890s run of five NL championships. His 1892 and 1898 teams each won 100 games, becoming the first teams to ever achieve the mark in baseball history ; their 102 wins in each season would not be surpassed by a National League team until 1902. After joining the Orphans, he helped build the team that would become the Cubs dynasty of the 1900s. He was elected to the National Baseball Hall of Fame in 1999.