Fenway Park is a baseball stadium located in Boston, Massachusetts, less than one mile from Kenmore Square. Since 1912, it has been the ballpark of Major League Baseball’s Boston Red Sox. While the stadium was built in 1912, it was substantially rebuilt in 1934, and underwent major renovations and modifications in the 21st century. It is the oldest active ballpark in MLB. Because of its age and constrained location in Boston's dense Fenway–Kenmore neighborhood, the park has many quirky features, including "The Triangle", Pesky's Pole, and the Green Monster in left field. It is the fifth-smallest among MLB ballparks by seating capacity, second-smallest by total capacity, and one of eight that cannot accommodate at least 40,000 spectators.

A ballpark, or baseball park, is a type of sports venue where baseball is played. The playing field is divided into two field sections called the infield and the outfield. The infield is an area whose dimensions are rigidly defined in part based on the placement of bases, and the outfield is where dimensions can vary widely from ballpark to ballpark. A larger ballpark may also be called a baseball stadium because it shares characteristics of other stadiums.