Monster High is an American multimedia-supported fashion doll franchise created by toy designer Garrett Sander and launched by Mattel in 2010. The show is aimed at children ages 7-14, the franchise features characters inspired by monster movies, sci-fi horror, thriller fiction, Folklore, Myths and Pop Culture, centering around the adventures of the teenage children of monsters and other mythical creatures attending a high school of the same name.

In the fictional American town of New Salem, the teenage children of famous monsters (and other mythical creatures) attend a high school called Monster High. The school is renowned for allowing all species of monsters to enroll in it: this is in contrast with other schools that exist in the franchise's fantasy world, which are reserved for one type of monster only (for example, a vampire-exclusive school). The characters' stories were told through the TV series, web series, films, the official website, as well as through diaries (booklets) included with the dolls. Since the franchise's beginnings in the late 2000s and early 2010s, Monster High has valued diversity among its characters and their visual appearance, personalities, abilities, and cultural backgrounds!