The term reverse trap is a concept used in anime and manga to describe a character who appears to be of the opposite gender to the one to which he or she actually belongs. The word "trap" is derived from English and is used to refer to a character who tricks other characters (and sometimes the viewer as well) into believing that he or she is of a different gender.

In the case of the "reverse trap", this is a character who, at first glance, appears to be female, but is actually a male character. These characters often have appearances and traits that are traditionally considered female, leading to confusion and surprise when their true gender is revealed.