Squirrel Girl is a superheroine appearing in American comic books published by Marvel Comics. Created by writer Will Murray and writer-artist Steve Ditko, the character first appeared in Marvel Super-Heroes vol. 2 #8, a.k.a. Marvel Super-Heroes Winter Special. Murray created the character out of a desire to write lighthearted stories, in contrast to the heavily dramatic tales that were then the norm in mainstream comics.

William Murray is an American novelist, journalist, short story, and comic book writer. Much of his fiction has been published under pseudonyms. With artist Steve Ditko, he co-created the superhero Squirrel Girl.