List of Boston Red Sox seasons
The Boston Red Sox are a professional baseball team based in Boston, Massachusetts, founded in 1901 as one of Major League Baseball (MLB)'s American League (AL) eight charter franchises under the name the "Boston Americans". First playing home games at Huntington Avenue Grounds, the team became known as the "Red Sox" in 1908, before establishing Fenway Park—the oldest active ballpark in MLB—as their home ballpark upon its construction in 1912.
A dominant team in the early 20th century, the Red Sox (as the Boston Americans) won the first World Series in 1903 and had won a further four championships by 1918. Their following 86-year championship drought is one of the longest in baseball history, often attributed to the "Curse of the Bambino" said to have been initiated against the Red Sox upon the 1919 trade of star player Babe Ruth to the New York Yankees. The Red Sox' drought ended when the team won their sixth World Series championship in 2004, and they have since gone on to win another three World Series titles (in 2007, 2013, and 2018), to become the first and so far only team to win at least four World Series championships in the 21st century. The team's overall .518 regular season winning percentage is the 5th-highest in MLB.
Between May 15, 2003, and April 10, 2013, a span of 820 games over almost 10 years, every home game the Red Sox played at Fenway Park was sold out. The Red Sox have won nine World Series championships in franchise history, and most recently qualified for the postseason in 2025.