棒球帽是一种帽子，又名鸭舌帽。通常没有边，前端有一个遮阳板可挡阳光，以达到防晒的效果。

此种帽子大多于休闲时戴上，以年轻人居多。

A baseball cap is a type of soft cap with a rounded crown and a stiff peak projecting in front. The front of the cap typically contains designs or logos of sports teams (namely baseball teams, or names of relevant companies, when used as a commercial marketing technique). The back of the cap may be "fitted" to the wearer's head size or it may have a plastic, Velcro, or elastic adjuster so that it can be quickly adjusted to fit different wearers. The baseball cap is a part of the traditional baseball uniform worn by players, with the brim pointing forward to shield the eyes from the sun. The cap is often seen in everyday casual wear.