A baseball park, also known as a ballpark or diamond, is a venue where baseball is played. A baseball park consists of the playing field and the surrounding spectator seating. While the diamond and the areas denoted by white painted lines adhere to strict rules, guidelines for the rest of the field are flexible. The term "ballpark" sometimes refers either to the entire structure, or sometimes to just the playing field. A home run where the player makes it around the bases, and back to home plate, without the ball leaving the playing field is typically called an "inside-the-park" home run. Sometimes a home run over the fence is called "out of the ballpark", but that phrase more often means a home run that clears the stands and lands outside the building. The playing field is most often called the "ballfield", though the term is often used interchangeably with "ballpark" when referring to a small local or youth league facility.

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