A baseball cap is a type of soft cap with a long, stiff bill that may either be curved or flat. The back of the cap may have a plastic,velcro , or elastic adjuster so that it can be quickly adjusted to fit different wearers.

While the baseball cap is specifically associated with those who play the game of baseball, it is often worn as a fashion statement as well as semi practical headgear. It is very popular in the United States, Brazil and Japan. Traditionally, the bill is worn forward, shielding the eyes from the sun, but it is also often worn backwards or at other angles. People with long hair in a ponytail may pull it through the gap in the cap above the adjustor.